case study structure consulting

Hacking the Case Interview

Case interview frameworks or consulting frameworks are arguably the most critical component of a case interview. Outstanding case frameworks   set you up for success for the case while poor frameworks make the case difficult to solve.

Struggling on how to use frameworks in your case interviews? Unsure of which frameworks to use?

Don't worry because we have you covered! We'll teach you step-by-step, how to craft tailored and unique frameworks for any case interview situation.

By the end of this article, you will learn four different strategies on how to create unique and tailored frameworks for any case interview.

Strategy #1: Creating Frameworks from Scratch

• Strategy #2: Memorizing 8 – 10 Broad Business Areas
• Strategy #3: Breaking Down Stakeholders
• Strategy #4: Breaking Down Processes
• Strategy #5: Two-Part MECE Frameworks

You will apply these strategies to learn how to create case frameworks for the six most common types of case interviews.

Profitability Framework

Market entry framework, merger and acquisition framework, pricing framework, new product framework, market sizing framework.

You will also learn six consulting frameworks that nearly every consultant knows.

Porter’s Five Forces Framework

Swot framework, 4 p’s framework, 3 c’s / business situation framework, bcg 2x2 matrix framework, mckinsey 7s framework.

If you’re looking for a step-by-step shortcut to learn case interviews quickly, enroll in our case interview course . These insider strategies from a former Bain interviewer helped 30,000+ land consulting offers while saving hundreds of hours of prep time.

What is a Case Interview Framework?

A case interview framework is simply a tool that helps you structure and break down complex problems into simpler, smaller components. Think of a framework as brainstorming different ideas and organizing them into different categories.

Let’s look at an example: Coca-Cola is a large manufacturer and retailer of non-alcoholic beverages, such as sodas, juices, sports drinks, and teas. They are looking to grow and are considering entering the beer market in the United States. Should they enter?

In order for you to decide whether Coca-Cola should enter the beer market, you likely have many different questions you’d like to ask:

• Does Coca-Cola know how to produce beer?
• Would people buy beer made by Coca-Cola?
• Where would Coca-Cola sell its beer?
• How much would it cost to enter the beer market?
• Will Coca-Cola be profitable from selling beer?
• How would Coca-Cola outcompete competitors?
• What is the size of the beer market in the United States?

This is not a very structured way of thinking through the case. The questions are listed in no particular order. Additionally, many of the questions are similar to one another and could be grouped together.

A case framework would provide a structure to organize these ideas and questions in a way that is easy to understand.

A framework for this case might look like the following.

Notice that we have simplified the list of questions we had into four main categories. These broad categories are frequently called framework “buckets.” Also notice that we have grouped similar questions together under each framework bucket.

This case framework tells us what areas we need to explore in order to make a recommendation to Coca-Cola. It also clearly shows what questions we need to answer under each area.

This is the power of a case interview framework. It simplifies a complex business problem into smaller and separate components that we can tackle one at a time.

So how do you develop a case framework? The next section will reveal four robust strategies for creating unique and tailored consulting frameworks for any case interview.

Case Interview Framework Strategies

There are four case interview framework strategies you should have in your toolkit:  

When given a case interview, you will need to decide which framework strategy you want to use. Some framework strategies will be more effective than others depending on what type of case interview you get.

Therefore, choose the case framework strategy that is easiest for you given the type of case that you get.

This case framework strategy can be used for any type of case. This is the most time-consuming strategy, but yields case frameworks that are the most tailored and unique for the given case interview.

To create a framework from scratch, ask yourself what 3 – 4 statements must be true for you to be 100% confident in your recommendation. These 3 – 4 areas will become the buckets in your framework.

Once you have your framework buckets, brainstorm a few questions for each bucket that you need answers to.

Let’s return to the Coca-Cola case example in which we are asked to determine whether or not they should enter the beer market. What 3 – 4 statements must be true for us to recommend that Coca-Cola should enter the beer market?

The four major statements that must be true are:

• The beer market is an attractive market
• Competitors in the market are weak
• Coca-Cola has the capabilities to produce outstanding beer
• Coca-Cola will be highly profitable from entering the beer market

These will be the major areas or buckets in our framework.

Next, let’s add a few bullet points under each area to add more detail to our case framework.

To determine whether the beer market is attractive, we would need to know the market size, the market growth rate, and the average profit margins in the market.

To assess whether the market is competitive, we would need to know who the competitors are, how much market share they have, and if they have any differentiation or competitive advantages.

To decide whether Coca-Cola has the capabilities to produce beer, we need to know if there are any capability gaps or if there are significant synergies that Coca-Cola can leverage.

Finally, to determine the expected profitability of entering the market, we would need to know what expected revenues are, what expected costs are, and how long it would take Coca-Cola to break even.

This gives us our case framework.

You can repeat this process for any case interview that you get to create an outstanding case framework.

Strategy #2: Memorizing 8 – 10 Broad Business Areas to Make a Framework

Creating case frameworks from scratch can be quite time-consuming. Because of this, many interview candidates make the mistake of using memorized frameworks for case interviews.

Candidates will either use a single memorized framework for every case or memorize a different framework for every type of case interview.

The issue with using memorized frameworks is that they aren’t tailored to the specific case you are solving for. When given an atypical business problem, your framework areas or buckets will not be entirely relevant.

A poor framework makes the case interview significantly more difficult to solve.

Additionally, Interviewers can easily tell that you are regurgitating memorized information and not thinking critically.

Instead of creating frameworks from scratch each time, this second case framework strategy provides a method to speed up the process while still creating frameworks that are unique and tailored to the case. Additionally, you won’t need to memorize multiple different frameworks.

First, memorize a list of 8 - 10 broad business areas, such as the following:

When given a case, mentally run through this list and pick the 3 - 5 areas that are most relevant to the case.

This will be your framework.

If the list does not give you enough areas for your framework, brainstorm and add your own ideas as areas to your framework.

Finally, add a few bullet points under each area to add more detail to your case framework.

This strategy guarantees that your framework elements are relevant to the case. It also demonstrates that you can create unique, tailored frameworks for every business problem.

Let’s return to the Coca-Cola case example in which we are asked to determine whether or not they should enter the beer market.

Running through our list of memorized framework areas, the following six areas would be relevant:

• Market attractiveness : Is the beer market attractive?
• Competitive landscape : How tough is competition?
• Company capabilities : Does Coca-Cola have the capabilities to enter the market?
• Profitability : Will Coca-Cola be profitable from entering the market?
• Risks : What are the risks of entering the market?
• Strategic alternatives : Are there other more attractive markets Coca-Cola should enter?

You can pick 3 – 5 of these areas as the basis for your framework.

This strategy is a shortcut for creating unique and tailored frameworks for every business problem. Even if you and a friend used this same strategy, you both may end up with different frameworks.

That is completely fine. As long as the buckets in your framework are major areas and are relevant to the case, your case framework will be significantly better than most candidates’ frameworks.

You do not need to develop a framework entirely from scratch every time to create outstanding case frameworks. This case framework strategy can be applied to over 90% of case interviews.

For the remaining 10% of case interviews, you will need to learn and use the next two case interview framework strategies.

Strategy #3: Breaking Down Stakeholders to Make a Framework

The first two case framework strategies can be applied to over 90% of cases. However, some cases may require you to identify and focus on various stakeholders that are involved in running or operating a business.

For these cases, the primary areas of your case framework will be these major stakeholders.

Let’s take a look at an example: Your client is a non-profit blood bank. They have volunteer nurses that go to schools and companies to collect blood from donors. They then sell this blood to hospitals, which use this blood for emergency situations when a blood transfusion is required. Currently, Hearts4Lives is not profitable because they are not able to collect enough blood to sell to their hospital partners. What can they do to fix this?

This case involves many different stakeholders:

• Volunteer nurses
• Blood donors
• Schools and companies

For cases in which many different stakeholders are involved, it will be useful to look at each stakeholder and determine what each could do to address the problem.

One potential framework could look like the following:

Strategy #4: Breaking Down Processes to make a Framework

Similar to the previous case framework strategy, some cases may require you to focus on improving or optimizing a particular process.

For these cases, the primary areas of your case framework will be each major step of the process.

Let’s take a look at an example: Your client is a waste disposal company that manages a fleet of drivers and garbage trucks that go to residential homes, collect garbage, and then dump the garbage in city landfills. They have an obligation to collect each home’s garbage once a week. Recently, they have been failing to meet this requirement and are backed up with garbage disposal requests. What is causing this issue and what should they do to fix it?

For cases involving processes and efficiencies, it can be helpful to look at the different components or steps in the process.

We can think about the process of collecting and disposing of garbage in the following steps:

• Get in a garbage truck
• Drive along a designated route
• Collect garbage at each stop
• Dispose of the garbage in the landfill

Using these steps as the primary areas of our framework, we can create the following case framework:

Once you have systematically listed all of the steps in a process, you can identify the pain points or bottlenecks that are causing the issue and determine ways to improve the process.

Strategy #5: Two-part MECE Frameworks

An easy way to make a 100% MECE framework is to use a two-part MECE framework. For the first step, start with a X and Not X framework. Some examples include:

• Internal / external
• Short-term / long-term
• Economic / non-economic
• Quantitative / qualitative
• Direct / indirect
• Supply-side / demand-side
• Upside / downside
• Benefits / cost

There are probably hundreds more frameworks that follow this pattern.

These frameworks are by definition 100% MECE. Since all of these frameworks are X or Not-X, they are mutually exclusive. There is no redundancy or overlap between X and Not-X.

Together, X and Not-X are also completely exhaustive. They cover the universe of all ideas and possibilities.

The X and Not-X framework by itself is good enough for a lot of the questions you could get asked in a case interview.

If you’re asked to brainstorm ways to decrease costs, you can create a framework consisting of decreasing variable costs and decreasing non-variable costs, also known as fixed costs.

If you’re asked to brainstorm barriers to entry, you can create a framework consisting of economic barriers to entry, such as cash and equipment, and non-economic barriers to entry, such as brand name or distribution channels.

However, to take your framework to the next level and truly impress your interviewer, we have the option of doing step two.

Step two involves adding another layer of X and Not X into your framework. What do we mean by this?

Let’s say you are trying to help a city decide whether they should host the upcoming summer Olympics. You start off with a framework consisting of benefits and costs. You can take this framework to the next level by adding another layer, such as adding in short-term and long-term.

With this additional layer, your framework now has four categories: short-term benefits, long-term benefits, short-term costs, and long-term costs. This is a 100% MECE framework that enables you to think through all possible considerations in deciding whether a city should host the Olympics.

Let’s look at another example. Suppose you are trying to figure out how to reduce a company’s costs. You start with a framework consisting of variable costs and fixed costs. You can take this framework to the next level by adding another layer, such as direct and indirect.

With this additional layer, your framework now has four categories: ways to directly reduce variable costs, ways to indirectly reduce variable costs, ways to directly reduce fixed costs, and ways to indirectly reduce fixed costs. This is another 100% MECE framework.

Case Frameworks: The 6 Most Common Frameworks

There are six common case frameworks in consulting case interviews.  

Profitability frameworks are the most common types of frameworks you’ll likely use in consulting first round interviews.

A profitability case might look like this: “An electric car manufacturer has recently been experiencing a decline in profits. What should they do?”

There are two steps to solving a profitability case.

First, you need to understand quantitatively, what is the driver causing the decline in profits?

You should know the following basic profit formulas.

Is the decline in profitability due to a decline in revenue, an increase in costs, or both?

On the revenue side, what is causing the decline? Is it from a decrease in quantity of units sold? If so, is the decrease concentrated in a particular product line, geography, or customer segment?

Or is the decline due to a decrease in price? Are we selling products at a lower price? Is there a sales mix change? In other words, are we selling more low-priced products and fewer high-priced products?

On the cost side, what is causing the increase in costs? Is it from an increase in variable costs? If so, which cost elements have gone up?

Or is the increase in costs due to an increase in fixed costs? If so, which fixed costs have gone up?

Next, you need to understand qualitatively, what factors are driving the decline in profitability that you identified in the previous step.

Looking at customers, have customer needs or preferences changed? Have their purchasing habits or behaviors changed? Have their perceptions of the company changed?

Looking at competitors, have new players entered the market? Have existing competitors made any recent strategic moves? Are competitors also experiencing a decline in profitability?

Looking at the market, are there any market trends that we should be aware of? For example, are there new technology or regulatory changes? How do these trends impact profitability?

Putting all of this together, we get the following profitability framework.

Once you have gone through this profitability framework and understand both quantitatively what is causing the decline in profits and qualitatively why this is happening, you can begin brainstorming ideas to address the profitability issue.

Among the ideas that you brainstorm, you can prioritize which recommendations to focus on based on the level of impact and ease of implementation.

See the video below for an example of how to solve a profitability case using this profitability framework.

Market entry frameworks are the second most common types of frameworks you’ll likely use in consulting first round interviews.

A market entry case might look like this: “Coca-Cola is considering entering the beer market in the United States. Should they enter?”

To create a market entry framework, there are typically four statements that need to be true in order for you to recommend entering the market:

• The market is attractive
• Competition is weak
• The company has the capabilities to enter
• The company will be highly profitable from entering the market

These statements form the foundation of our market entry framework.

Note the logical order of the buckets in the framework.

We first want to determine whether the market is attractive. Then, we need to check if competition is weak and if there is an opportunity to capture meaningful market share.

If these two conditions are true, then we need to confirm that the company actually has the capabilities to enter the market.

Finally, even if the company has the capabilities to enter the market, we need to verify that they will be profitable from entering.

This is a logical progression that your market entry framework will take you through to develop a recommendation for market entry cases.

Merger and acquisition frameworks are also common frameworks you’ll use in consulting interviews.

There are two common business situations.

The first situation is a company looking to acquire another company in order to access a new market, access new customers, or to grow its revenues and profits.

Another situation is a private equity company looking to acquire a company as an investment. Their goal is to then grow the business using their operational expertise and then sell the company years later for a high return on investment. This type of case interview is called a private equity case interview .

In either of these situations, mergers and acquisition cases typically involve acquiring an attractive, successful company.

It is rare to get a case in which a company or private equity firm is looking to acquire a poorly performing company to purchase at a discount. Nevertheless, you can always clarify the goal of the merger or acquisition with the interviewer before beginning the case.

In order to recommend making an acquisition, four statements need to be true.  

• The market that the acquisition target is in is attractive
• The acquisition target is an attractive company
• The acquisition generates meaningful synergies
• The acquisition target is at a great price and will generate high returns on investment

These statements become the basis of our merger and acquisition framework.

Synergies is an area that should absolutely be included in any merger or acquisition framework. A merger or acquisition can lead to revenue synergies and cost synergies.

Revenue synergies include:

• Having access to new customer segments
• Having access to new markets
• Having access to new distribution channels
• Cross-selling opportunities
• Up-selling opportunities

Cost synergies include:

• Eliminating cost redundancies
• Consolidating functions or groups
• Increasing buying power with suppliers, manufacturers, distributors, or retailers

Pricing frameworks are used in cases involving the pricing of a product or service. To develop a pricing framework, you should be familiar with the three different ways to price a product or service.

• Pricing based on costs : set a price by applying a profit margin on the total costs to produce or deliver the product or service
• Pricing based on competition : set a price based on what competitors are charging for products similar to yours
• Pricing based on value added : set a price by quantifying the benefits that the product provides customers

Your answer to pricing cases will likely involve a mix of all three of these pricing strategies.

Your pricing framework will look something like the following.

Pricing based on costs will determine the minimum price you can realistically set. Pricing based on value added will determine the maximum possible price. Pricing based on competition will determine which price in between these two price points you should set.

In order to get customers to purchase your product, the difference between your price point and the customer’s maximum willingness to pay must be greater than or equal to the difference between your competitor’s price point and the customer’s maximum willingness to pay for their product.

New product frameworks are used to help a company decide whether or not to launch a product or service.

New product frameworks share many similarities with market entry frameworks. In order to recommend launching a new product, the following statements would need to be true:

• The product targets an attractive market segment
• The product meets customer needs and is superior to competitor products
• The company has the capabilities to successfully launch the product
• Launching the product will be highly profitable

Expanding on these areas, your new product framework could look like the following:

A comprehensive guide to market sizing questions and market sizing frameworks can be found in our comprehensive market sizing article. You can also watch the video below:

As a summary, market sizing or estimation questions ask you to determine the size of a particular market or to estimate a particular figure.

There are two different market sizing frameworks or approaches:

• Top-down approach : start with a large number and then refine and break down the number until you get your answer
• Bottom-up approach : start with a small number and then build up and increase the number until you get your answer

To create your market sizing framework, simply write out in bullet points, the exact steps you would take to calculate the requested market size or estimation figure.

Consulting Frameworks Every Consultant Knows

There are six consulting frameworks that nearly every consultant knows.

I would not recommend using these exact frameworks during a case interview because the interviewer may think you are just regurgitating memorized information instead of thinking critically about the case.

Instead use the four framework strategies that we covered earlier in this article to create tailored and unique frameworks for each case.

Nevertheless, it is helpful to review these common consulting frameworks in order to understand the fundamental concepts and business principles behind them.

Porter’s Five Forces framework was developed by Harvard Business School professor Michael Porter. This framework is used to analyze the attractiveness of a particular industry.

There are five forces that determine whether an industry is attractive or unattractive.

Competitive rivalry:  How competitive is the industry?

The more competitive an industry is in terms of number and strength of competitors, the less attractive the industry is. The less competitive an industry is, the more attractive the industry is.

Supplier power:  How much power do suppliers have?

Suppliers are companies that provide the raw materials for your company to produce goods or services. The fewer suppliers there are, the more bargaining power suppliers have in setting prices. The more suppliers there are, the weaker bargaining power suppliers have in setting prices.

Therefore, high supplier power makes the industry less attractive while low supplier power makes the industry more attractive.   

Buyer power:  How much power do buyers have?

Buyers are customers or companies that purchase your company’s product. The more buyers there are, the weaker bargaining power buyers have in setting prices. The fewer buyers there are, the more bargaining power buyers have in setting prices.

Therefore, high buyer power makes the industry less attractive while low buyer power makes the industry more attractive.   

Threat of substitution:  How difficult is it for customers to find and use substitutes over your product?

The availability of many substitutes makes the industry less attractive while a lack of substitutes makes the industry more attractive

Threat of new entry:  How difficult is it for new players to enter the market?

If barriers to entry are high, then it is difficult for new players to enter the market and it is easier for existing players to maintain their market share.

If barriers to entry are low, then it is easy for new players to enter the market and more difficult for existing players to maintain their market share.

A low threat of new entrants makes the market more attractive while a high threat of new entrants makes the market less attractive.

A SWOT framework is used to assess a company’s strategic position. SWOT stands for strengths, weaknesses, opportunities, and threats.

Strengths : What does the company do well? What qualities separate them from competitors?

Weaknesses : What does the company do poorly? What are the things that competitors do better?

Opportunities : Where are the company’s opportunities for growth or improvement?

Threats : Who are the most threatening competitors? What are the major risks to the company’s business?

The 4 P’s framework is used to develop a marketing strategy for a product. The 4 P’s in this framework are: product, place, promotion, and price.

Product : If there are multiple products or different versions of a product, you will need to decide which product to market. To do this, you will need to fully understand the benefits and points of differentiation of each product.

Select the product that best fits customer needs for the customer segment you are focusing on.

Place : You will need to decide where the product will be sold to customers. Different customer segments have different purchasing habits and behaviors. Therefore, some distribution channels will be more effective than others.

Should the product be sold directly to the customer online? Should the product be sold in the company’s stores? Should the product be sold through retail partners instead?

Promotion : You will need to decide how to spread information about the product to customers. Different customer segments have different media consumption habits and preferences. Therefore, some promotional strategies will be more effective than others.

Promotional techniques and strategies include advertising, social media marketing, email marketing, search engine marketing, video marketing, and public relations. Select the strategies and techniques that will be the most effective.

Price : You will need to decide how to price the product. Pricing is important because it determines the profits and the quantity of units sold. Pricing can also communicate information on the quality or value of the product.

If you price the product too high, you may be pricing the product above your customer segment’s willingness to pay. This would lead to lost sales.

If you price the product too low, you may be losing potential profit from customers who were willing to pay a higher price. You may also be losing profits from customers who perceive the product as low-quality due to a low price point.

In deciding on a price, you can consider the costs to produce the product, the prices of other similar products, and the value that you are providing to customers.

The 3 C’s framework is used to develop a business strategy for a company. 3 C’s stands for customers, competition, and company.

The business situation framework was developed by a former McKinsey consultant, Victor Cheng, who added a fourth component to this framework, product.

Both of these frameworks are used to develop a business strategy for a company in a variety of situations, such as market entry, new product launch, and acquisition.

There is another similar framework called the 4C framework that expands upon the 3 C's. The 4C framework stands for customer, competition, capabilities, and cost.

The BCG 2x2 Matrix Framework was developed by BCG founder Bruce Hendersen. It is used to examine all of the different businesses of a company to determine which businesses the company should invest in and focus on.

The BCG 2x2 Matrix has two different dimensions:

• Market growth : How quickly is the market growing?
• Relative market share : How much market share does the company have compared to competitors?

Each business of the company can be assessed on these two dimensions on a scale of low to high. This is what creates the 2x2 Matrix because it creates four different quadrants.

Each quadrant has a recommended strategy.

• Stars : These are businesses that have high market growth rate and high relative market share. These businesses should be heavily invested in so they can continue to grow.
• Cows :   These are businesses that have low market growth rate, but high relative market share. These businesses should be maintained since they are stable, profitable businesses.
• Dogs :   These are businesses that have low market growth rate and low relative market share. These businesses should not be invested in and should possibly even be divested to free up cash for other businesses.
• Unknown : These are businesses that have high market growth rate and low relative market share. The strategy for these businesses is not clear. With enough investment, these businesses could become stars. However, these businesses could also become dogs if the market growth slows or declines.

The McKinsey 7S Framework was developed by two former McKinsey consultants, Tom Peters and Robert Waterman. The 7S Framework identifies seven elements that a company needs to align on in order to be successful.

These elements are:

• Strategy : The company’s plan to grow and outcompete competitors
• Structure : The organization of the company
• Systems : The company’s daily activities and processes
• Shared values : The core beliefs, values, or mission of the company
• Style : The style of leadership or management used
• Staff : The employees that are hired
• Skills : The capabilities of the company’s employees

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47 case interview examples (from McKinsey, BCG, Bain, etc.)

One of the best ways to prepare for   case interviews  at firms like McKinsey, BCG, or Bain, is by studying case interview examples. 

There are a lot of free sample cases out there, but it's really hard to know where to start. So in this article, we have listed all the best free case examples available, in one place.

The below list of resources includes interactive case interview samples provided by consulting firms, video case interview demonstrations, case books, and materials developed by the team here at IGotAnOffer. Let's continue to the list.

• McKinsey examples
• BCG examples
• Bain examples
• Deloitte examples
• Other firms' examples
• Case books from consulting clubs
• Case interview preparation

Click here to practise 1-on-1 with MBB ex-interviewers

1. mckinsey case interview examples.

• Beautify case interview (McKinsey website)
• Diconsa case interview (McKinsey website)
• Electro-light case interview (McKinsey website)
• GlobaPharm case interview (McKinsey website)
• National Education case interview (McKinsey website)
• Talbot Trucks case interview (McKinsey website)
• Shops Corporation case interview (McKinsey website)
• Conservation Forever case interview (McKinsey website)
• McKinsey case interview guide (by IGotAnOffer)
• McKinsey live case interview extract (by IGotAnOffer) - See below

2. BCG case interview examples

• Foods Inc and GenCo case samples  (BCG website)
• Chateau Boomerang written case interview  (BCG website)
• BCG case interview guide (by IGotAnOffer)
• Written cases guide (by IGotAnOffer)
• BCG live case interview with notes (by IGotAnOffer)
• BCG mock case interview with ex-BCG associate director - Public sector case (by IGotAnOffer)
• BCG mock case interview: Revenue problem case (by IGotAnOffer) - See below

3. Bain case interview examples

• CoffeeCo practice case (Bain website)
• FashionCo practice case (Bain website)
• Associate Consultant mock interview video (Bain website)
• Consultant mock interview video (Bain website)
• Written case interview tips (Bain website)
• Bain case interview guide   (by IGotAnOffer)
• Digital transformation case with ex-Bain consultant
• Bain case mock interview with ex-Bain manager (below)

4. Deloitte case interview examples

• Engagement Strategy practice case (Deloitte website)
• Recreation Unlimited practice case (Deloitte website)
• Strategic Vision practice case (Deloitte website)
• Retail Strategy practice case  (Deloitte website)
• Finance Strategy practice case  (Deloitte website)
• Talent Management practice case (Deloitte website)
• Enterprise Resource Management practice case (Deloitte website)
• Footloose written case  (by Deloitte)
• Deloitte case interview guide (by IGotAnOffer)

5. Accenture case interview examples

• Case interview workbook (by Accenture)
• Accenture case interview guide (by IGotAnOffer)

6. OC&C case interview examples

• Leisure Club case example (by OC&C)
• Imported Spirits case example (by OC&C)

7. Oliver Wyman case interview examples

• Wumbleworld case sample (Oliver Wyman website)
• Aqualine case sample (Oliver Wyman website)
• Oliver Wyman case interview guide (by IGotAnOffer)

8. A.T. Kearney case interview examples

• Promotion planning case question (A.T. Kearney website)
• Consulting case book and examples (by A.T. Kearney)
• AT Kearney case interview guide (by IGotAnOffer)

9. Strategy& / PWC case interview examples

• Presentation overview with sample questions (by Strategy& / PWC)
• Strategy& / PWC case interview guide (by IGotAnOffer)

10. L.E.K. Consulting case interview examples

• Case interview example video walkthrough   (L.E.K. website)
• Market sizing case example video walkthrough  (L.E.K. website)

11. Roland Berger case interview examples

• Transit oriented development case webinar part 1  (Roland Berger website)
• Transit oriented development case webinar part 2   (Roland Berger website)
• 3D printed hip implants case webinar part 1   (Roland Berger website)
• 3D printed hip implants case webinar part 2   (Roland Berger website)
• Roland Berger case interview guide   (by IGotAnOffer)

12. Capital One case interview examples

• Case interview example video walkthrough  (Capital One website)
• Capital One case interview guide (by IGotAnOffer)

12. EY Parthenon case interview examples

• Candidate-led case example with feedback (by IGotAnOffer)

14. Consulting clubs case interview examples

• Berkeley case book (2006)
• Columbia case book (2006)
• Darden case book (2012)
• Darden case book (2018)
• Duke case book (2010)
• Duke case book (2014)
• ESADE case book (2011)
• Goizueta case book (2006)
• Illinois case book (2015)
• LBS case book (2006)
• MIT case book (2001)
• Notre Dame case book (2017)
• Ross case book (2010)
• Wharton case book (2010)

Practice with experts

Using case interview examples is a key part of your interview preparation, but it isn’t enough.

At some point you’ll want to practise with friends or family who can give some useful feedback. However, if you really want the best possible preparation for your case interview, you'll also want to work with ex-consultants who have experience running interviews at McKinsey, Bain, BCG, etc.

If you know anyone who fits that description, fantastic! But for most of us, it's tough to find the right connections to make this happen. And it might also be difficult to practice multiple hours with that person unless you know them really well.

Here's the good news. We've already made the connections for you. We’ve created a coaching service where you can do mock case interviews 1-on-1 with ex-interviewers from MBB firms . Start scheduling sessions today!

Related articles:

The Ultimate Guide to the Consulting Case Interview – With Examples

This guide, written by a former McKinsey consultant and Wharton MBA, breaks down the management consulting case interview into comprehensible parts with relevant, realistic examples at every turn.

By  Tracy V.

Posted March 12, 2024

Featuring Karthik R.

Ask Me Anything: Management Consulting

Starting sunday, august 18.

4:00 PM UTC · 30 minutes

Table of Contents

While the consulting case study interview may seem daunting at first, most cases follow a typical song-and-dance. Once you get a hang of it, prepping feels much more manageable. The first part of this guide will give a broad overview of the case interview. The second part will break out the typical structure of an interviewee-led case. The last part will dive into each component, with tips and suggestions for preparing. Note that some firms may have their own specific case interview style. Be sure to familiarize yourself with your target firms’ interview processes before the time comes to recruit.

Case interviews involve tackling a business issue or problem faced by a company (the client). These interviews allow consulting firms to gauge candidates’ ability to perform the job. Specifically, firms are testing whether candidates can:

• Think in a structured and creative way
• Analyze and interpret new information
• Communicate persuasively and succinctly

Most firms conduct interviewee-led cases, as outlined in the guide below. In these cases, the candidate is expected to drive the case forward by asking the interviewer for data or information relevant to forming the recommendation. A few firms, most notably McKinsey, are interviewer-led, meaning that the interviewer will be the one guiding the discussion.

Below are a few common types of cases that you can expect to receive. Some cases can be several types all in one (lucky you!):

• Profitability - Determine cause for profit decline and / or ideas for increasing profit; you will rarely get a standalone profitability case – It will usually be rolled up in another case type
• Growth - consider strategies for company growth; could be through sales or market share
• Market Entry / New Business - Assess attractiveness of entering new geography / business / sector and method for entering
• Due Diligence / M&A - Assess attractiveness of purchasing / acquiring a company or business; client can be another company or a financial sponsor
• Competitive Response - Address a competitor’s recent action (e.g., new acquisition, change in pricing strategy)
• Non-Traditional - Similar to the other cases but the client (non-profit, NGO, education-focused entity) has different objectives than a typical corporate company

Case Interview Components

• Prompt: Interviewer reads aloud the case while the interviewee takes notes
• Recap: Interviewee provides a high-level summary of the case and confirms accuracy of information written
• Clarifying Questions: Interviewee asks 2-3 high-level questions
• Structuring (<2 minutes): Interviewee takes a few minutes create a roadmap for approaching the case
• Framework Presentation (2-3 minutes): Interviewee reviews the structure with the interviewer, who may have follow-up questions. Interviewee then moves the case forward by asking for additional information
• Brainstorming: Interviewee is expected to list out several solutions or ideas (e.g., cost drivers for an industry, ways to increase sales)
• Exhibits: Interviewee will be given data in forms such as graphs or charts and expected to provide high-level insights
• Math: Interviewee will be asked to perform a calculation with the new information or using data from the exhibits. Oftentimes, interviewee is not given enough information and must ask for the relevant data
• Synthesis and Recommendation (2-3 minutes) : Interviewee provides the answer first, then supporting facts from the case, and finally risks and next steps

Setup (2-3 minutes)

Prompt : The interviewer may be giving you A LOT of information - don’t write down everything verbatim. Jot down facts and figures, the client name, and the objective(s). If you miss something or don’t remember what a number means, you can ask after your recap.

• Prep: Have a friend read you several different case interview prompts and practice taking down notes. Create your own shorthand and learn how to recognize extraneous pieces of information

Recap : I always reference the client by name and start my recap with the objective(s) first, since this is the most important part of the case. The recap should be summarized, not verbatim, and you should be checking that the figures you wrote down are correct.

• Prep: Practice summarizing your notes out loud instead of repeating the case verbatim. Time yourself to make sure it’s <1 minute.

Clarifying Questions : Very detailed questions should be saved for the case. Clarifying questions are meant to help you with your structure or alleviate any confusion. Keep these at 2-3 questions. I usually ask questions pertaining to:

• Language/terminology - The interviewer won’t expect you to know the nuances of every industry or practice area. It is better you start off the case on the right footing by asking for clarifying definitions
• Goals/objectives - I always ask if there are other goals the company has in mind and, if relevant, specific financial targets or timeframe. Sometimes, the objective given is vague, so I will ask the interviewer to be more specific.
• Business model or geography - Very helpful for cases in niche industries; understanding geography can also prompt you to think about factors like labor cost or global competition
• Scope - To save you time from considering every possibility, you can ask whether the company is leaning towards one option or excluding a set of options completely
• Prep: Have a friend read you case prompts and then practice asking 2-3 clarifying questions on the fly. Try to think of them as you’re taking down notes and giving the recap. Are they helping you with your structuring or are you asking the first thing that pops into your head? Are they broad enough or overly detailed? Are there types of questions you should be asking but keep forgetting?

Framework (4-5 minutes)

Structuring (<2 minutes) : Do not use the word “framework” during the interview. I ask if I could have time to “gather my thoughts” when I am structuring. In your structure, you should have at least three but no more than five “buckets.” These are areas that you want to explore in order to solve the case. In each bucket, there should be at least three sub-bullets. Make sure there is no overlap between the buckets.

• Prep: Time yourself structuring your roadmaps. Be comfortable with recalling the different buckets you should be considering for each type of case and brainstorming sub-bullets for those buckets. It’s okay to go over two minutes when you first start, but as you get comfortable, make sure you are becoming more efficient. For example, as you become more familiar with the buckets, you don’t need to write down every example for the sub-bullets, they will become muscle memory as you recite them out loud. Review the suggested frameworks for the case and take note of whether there are vital topics you keep forgetting or whether there are unnecessary buckets you keep adding. There is no one “right” answer, but your roadmap should enable you to uncover the necessary information to make your recommendation.

Presenting: Introduce the high-level buckets first before diving into each one. You will want to “customize” your framework to the specific case you’re working on. This does not mean creating a custom framework for every single case. You can use the same topics for similar types of cases (but ensure that those topics are relevant - some cases sneakily rule out an entire topic to see if you are paying attention), but you need to make sure that you are using case-specific language and examples when you present. This shows that you are thinking about the specific problem, not just recycling a generic framework. After going through the structure, pause and ask if the interviewer has any questions. Then, give your hypothesis and state which bucket you want to start with by asking for data pertaining to that bucket and why you want it.

• Prep: Present your structures out loud and note whether you are rambling or being case-specific in your language. If you find that your presentation is too long, consider cutting down on the examples or explanations. Be succinct and say enough to get your point across. Don’t just move on to the next case if your presentation falls short. Keep practicing until you feel satisfied and make mental notes for the next case.

Interview “Questions” (10-20 minutes)

For each type of question, you are going to be doing the same things: answering the question, providing insights, conveying how it impacts your recommendation, and driving the case forward. Every time you have “answered” a question, you want to be thinking, “ What else do I need? What’s the logical path forward ?” The only way you can prepare for this is to run through entire cases! Remember, your framework is your friend. Refer back to it often if you don’t know where to go next.

Brainstorming : You will want to structure your ideas into MECE buckets. They can be fairly simple (financials vs. non-financials, external vs. internal, etc.). Similar to your framework, you will give a preview of the buckets first before going into the details of each and you will need to ensure that it is “custom” for your case. If a structure doesn’t naturally come to you, you can create a pseudo-structure by organizing how you will present your brainstorm. For example, you can state how many ideas you have from the onset or say that you will first go through the ideas first and then the associated risks.

This is a highly debated practice, but I always ask for a few seconds so I can think of a structure (they may say no). Don’t take more than 30 seconds because you can add to your buckets as you are presenting.

For non-technical brainstorms, be creative! For example, when interviewers asked about how to increase sales for a consumer-facing retail company, I would bring up TikTok campaigns and celebrity endorsements as a few ideas. Have fun with it!

Occasionally, interviewers will prod you with, “What else?” This does not always mean you didn’t give enough ideas. Sometimes it’s the opposite – they are looking to challenge you or see how you will react. Just roll with it - if you don’t have anything else, say so.

• Prep: Practice brainstorming for different types of prompts. Collect a bank of general ideas and solutions that can be customized for use across industries. Try to think of as many ideas as you can (four to six at the very least) and exercise that creative muscle. To help you with structuring, have a list of “easy” MECE buckets that you can pull out on the fly.

Exhibits : First, give an overview of the exhibit. As an example, for graphs say what the axes represent, tie it back to the case, and give your interpretation of those axes. This gives the interviewer a chance to course-correct if you misinterpreted the exhibit. Give some insight, even if it is low-hanging fruit, and tie it back to the case. There are three levels of insights for both exhibits and math:

• What the numbers say, patterns/trends (X is smaller than anticipated, Y is the largest driver)
• What the client should do (enter the market, cancel plans, plan for launch)
• What we should do next (reconsider something specific, research more data on X, move on to Y)

Oftentimes, exhibits will tie into a calculation. If you are given an exhibit with data that can be used to calculate more insightful information, tell the interviewer that you would like to make those calculations. The interviewer will lead you down that path regardless but it is more impressive if you call it out.

• Prep: Run through different types of exhibits and see how many insights from each level you can pull out. Practice anticipating what type of data you need next in order to move ahead in the case or whether you can/should calculate anything from the data given. Don’t be too insightful though – you only have a limited amount of time to run through the case.

Math : Before you start calculating anything, it is critical for you to confirm what you are solving for and that the information you wrote down is correct. SUPER IMPORTANT – answer the question that is being asked !!  If the interviewer is asking for the incremental profit from a certain strategy, you don’t want to calculate the total profit from the strategy. Active listening is so important!

As you know by now, structure is everything. Again, I always ask for a few seconds to organize my thoughts (the worst thing they can say is no). Set up the problem before you start calculating. This allows you to identify whether there is data missing. Walk the interviewer through your method and ask for missing data. You may need to make your own assumptions or estimates – be sure you can justify them.

If your method is off, the interviewer will usually guide you back to the right path. This saves you from wasting time calculating the incorrect answer. Be sure to pay attention when the interviewer is trying to coach you.

As you are solving the problem, walk the interviewer through each calculation and use math shortcuts as much as possible. Again, if you make a math error, the interviewer can stop you before you go down the entire path. Save time by only calculating what is important for the case and understanding what you can skip.

• Prep: Practice setting up the problem, walking the interviewer through your proposed method, and verbalizing the calculations out loud. On paper, make sure your calculations are being done neatly and not all over the place. Look for different math shortcuts and try them out. Not all of them will fit your style, but you might find new tricks. Track whether you are answering the right questions. Once again, active listening is critical to your candidacy. Once you have correctly solved the problem, make sure you are thinking about the, “So what?” Determine how that number impacts your recommendation and where you should go next.

Synthesis and Recommendation (2-3 minutes)

Again, I always ask for a few seconds to collect your thoughts (<30 secs). If the “CEO is already in the elevator,” they may say no. Have a definitive stance – start with your recommendation and then provide two to three supporting facts using data from the case.

Address risks and next steps (i.e., what is the required analysis/gameplan – this is like real life where the firm is trying to sell additional projects). Your recommendation should be <2 minutes. Frankly, the interviewer has most likely made a decision on your candidacy. Don’t ramble and try to finish strong.

The hardest part of this is pulling out the supporting data in a succinct way. Throughout the case, you should be jotting down notes. I tend to circle what I believe to be relevant supporting data. When you present it, don’t be too specific or granular. You want your recommendation to be punchy.

• Prep: Run through whole cases where you are tracking the relevant supporting data along the way. Time your recommendation and practice verbalizing the information concisely. Don’t forget the risks and next steps. I usually have a list of generic risks (e.g., competitor response, regulation, inaccurate projections) that I can “customize” on the off-chance I’m scrambling to think of some. Your next steps can be collecting additional data to support your recommendation or ways to address those risks.

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Final Thoughts

• Your approach is more important than the solution – The interviewer is trying to understand how you think. Some cases have data that support recommendations in either direction. The key piece is that you are able to back your stance using the facts and data uncovered during the interview.
• Deadends are okay – There will be times when you make multiple requests for data and the interviewer does not have it. That’s perfectly fine! You can’t read the interviewer’s mind and the case could go in so many directions. Just look back at your framework to see where else you can proceed.
• Be coachable – It’s not the end of the world if your method is wrong or if you misinterpreted an exhibit. The interviewer wants to see that you are actively listening and can take feedback and improve. Don’t freak out! Stay calm! Listen to what the interviewer is trying to tell you.

This guide only scratches the surface of case interviews. The best way to prepare for case interviews is to get your reps in with entire cases. That way, you can identify your areas of weakness and be more precise with the drills. I can give you feedback and additional tips and tricks so that you are performing at your best on interview day. Book a free intro call with me on my Leland profile to discuss how we can personalize your case prep plan!

Preparing for consulting recruiting and/or case interviews? Here are some additional resources to help:

• Top 3 Tactics to Ace Your Case Interview
• A Comprehensive Guide to McKinsey & Co., Bain & Co., and Boston Consulting Group
• From No Offers to Multiple Offers - How to Take Your Casing to the Next Level
• How a Disneyland Churro Helped Me Land a Job at Bain (and 5 Pitfalls to Avoid in Market Sizing Problems)
• Five Tips to Break Into Management Consulting

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How To Write A Consulting Case Study: Guide, Template, & Examples

When you deliver a successful project, do you publish a consulting case study about it?

A consulting case study is a short story about a successful project that explains…

• The problem your client was dealing with before hiring you;
• your expertise and process for solving that problem;
• and the results your expertise and process created for the client and their business.

In my experience, our consulting case studies are among the most powerful pieces of content we publish. They’re a big reason why people are comfortable signing up for our Clarity Coaching Program .

Because our case studies prove our program helps our clients get results.

I can say that our coaching program is the best on the market until I’m blue in the face.

But it’s much more powerful for consultants to see the results others have experienced for themselves: through our case studies and testimonials.

If you don’t have something of value on your website like a case study — something that actually shows you can achieve results for your clients — then your website will only serve as “confirmational marketing.”

It will confirm what people hear about you. But it won’t help you generate interest and leads.

So, if you want to shift your website beyond mere confirmational marketing to an asset that helps you generate leads and conversions, consider writing consulting case studies using the method below.

In this article, you’ll learn how to write compelling case studies that help you win more consulting clients.

Ready? Let’s dive in…

Your case study is proof that not only can you talk the talk, but you can also walk the walk.

What Is A Consulting Case Study?

When a potential client is deciding on whether they will hire you or not, a big question in their mind is…

“Can this person or company really do what they say they can for my business?”

There are many forms of thought leadership you can use to prove you can deliver results.

The consulting case study is one of them.

A case study, in the context of consulting, is typically a written document that describes…

• the problem a client was facing,
• the actions you took to solve that problem,
• and the outcomes it created for your client.

You write case studies to demonstrate the results and value you created for a past or current client.

What makes them so effective as marketing material?

• They are relatively easy to put together (especially when you use our template below).
• Your potential clients enjoy reading them.
• And they are a highly effective way to demonstrate your authority and expertise in your field.

Next, I’ll walk you through how to write a consulting case study.

In our program, one of the things we teach consultants is how to better understand their clients’ problems and articulate their ability to solve those problems in a way that will attract new clients.

How To Write A Consulting Case Study

Here are the steps to writing your consulting case study. You can follow along with our consulting case study template .

1. Get Permission From The Client

You shouldn’t write a case study that names your client without their permission.

So, before you start writing it, ask them if they’d be OK with you publishing a case study about the project.

Now, I’m not a lawyer, and nothing in this article or anything I write is legal or financial advice. But here’s what we’ve found, through running consulting businesses for over two decades, often works best:

A question we often receive from consultants is “What if I can’t use the name of my client or the company I worked with?” Generally, this isn’t an issue. If your contract says you can’t use the client’s company name, or the client says “No” to your request, all is not lost.

What tends to work extremely well is still writing the case study, but without using the client’s name. Instead, describe the client.

For example, let’s say your client is the automaker Mazda. If you can’t use their name, consider “Working with a top 20 global automaker…”

This gives prospective buyers a good idea of the caliber and type of company you worked with.

When you ask your client for their permission to create a case study that features them, you’ll generally find that 9 times out of 10 they won’t have a problem with you doing so, but make sure you ask before publishing.

2. Introduce The Client’s Business

Once you’ve gotten permission from the client, you’ll begin writing your case study. Follow along using our template .

The first section is the introduction. Set the stage here by introducing your client, their business, and their industry.

This section gives context to the case study. Ideally, your ideal client is intrigued by being in a similar industry or situation as the client in your case study.

3. Describe The Problem Or Challenge

In this section, you outline the problem your client was facing.

Be as specific as you can be.

Simply saying they had marketing issues or a problem with their PR is not enough.

The more detail you include the clearer the picture will become and the more effective your case study copywriting will be.

If your ideal client reads this and has a similar problem as the client in the case study, you can guarantee that their eyes will be glued to the screen, salivating to learn how you solved it.

4. Summarize Your Action Steps

Now that you’ve described the problem your client was up against, you’ll explain what you did to help solve the problem.

In this section, break down each part of the process you used or the steps you took to solve it.

The reader should get the sense that you have a process or system capable of solving the problem and getting results.

This is where you get to demonstrate your know-how and expertise. Get as technical as you can. Show your reader “Hey, this is how I can get YOU results too.”

5. Share The Results

It’s time to demonstrate results.

Write the results that were achieved and how they impacted the business/organization/person.

In many cases, the outcome isn’t just dollars and cents — it can also be less tangible value.

Are they less stressed? Do they have more free time? Are they finding more meaning and enjoyment in their work?

Mention if you’re continuing to work with this client through a retainer . If you’re not, describe how the results will impact their business in the future.

This is also a great place to include a quote or testimonial from your client.

The “Results” section is key because it shows prospective clients that you’ve solved the problems they are facing and have delivered the actual results that they likely desire.

6. Write A Call To Action

At the end of the case study, you should always include a sentence or two inviting the ideal client to reach out.

They’ve just read about the problems you can solve, how you solve them, and the results you can create.

They are primed and ready to reach out to inquire about how you can do it for them.

But if you don’t have a direct call to action for them to do that, many of them will leave without taking action.

So, write a direct, clear call to action that takes them to a page where it’s easy to book a consultation with you or where you provide your contact information.

7. Share It

Marketing for consultants is all about providing value to your ideal clients, being known for something specific, and positioning yourself as an expert and authority that your ideal clients want to work with. So, whenever you publish a piece of valuable content like a case study, your mission is to get as many eyes on the case study as possible.

The best place to publish your case study is on your website or blog.

You can also submit case studies to industry publications. These are a great way to spread the word about you and your client’s business.

Make sure to also share your case study on all social media platforms where your ideal clients hang out online. For consultants, that means LinkedIn.

Work your “marketing muscle” by actively promoting your case study, and you’ll reap the rewards of this powerful piece of authority-building content.

Writing case studies for your consulting business not only helps you land new clients, but it’s also a great way for you to review past projects.

Doing this helps you to find what worked and what didn’t.

And you’ll continue to learn from your experiences and implement your best practices into your next consulting project.

Consulting Case Study Template

Click here to access our Consulting Case Study Template .

This template is designed using a “fill in the blank” style to make it easy for you to put together your case studies.

Save this template for yourself. Use it to follow along with the examples below.

Consulting Case Study Examples

Here are some example case studies from our Clarity Coaching Program clients.

1. Larissa Stoddart

Larissa Stoddart teaches charities and nonprofits how to raise money.

To do that, she provides her clients with a training and coaching program that walks them through twelve modules of content on raising money for their organization, creating a fundraising plan, putting an information management system into place, finding prospects, and asking those prospects for money.

Through her case studies, Larissa provides a comprehensive overview of how she helps her clients build robust fundraising plans and achieve and win more donations.

2. Dan Burgos

Danila “Dan” Burgos is the president and CEO of Alphanova Consulting, which works with US manufacturers to help them increase their profitability through operational improvements.

The goal of Alphanova is to increase their clients’ quality and on-time delivery by 99 percent and help them increase their net profits by over 25 percent.

Through his case studies, Dan lays out the problem, his solution, and the results in a clear simple way.

He makes it very easy for his prospects to envision working with his firm — and then schedule a consultation to make it happen.

3. Vanessa Bennet

Through her company Next Evolution Performance, Vanessa Bennett and her business partner Alex Davides, use neuroscience to help driven business leaders improve their productivity, energy, profitability, and staff retention, while avoiding burnout.

Through her “Clients” page, she provides a list of the specific industries she works with as well as specific case studies from clients within those industries.

She then displays in-depth testimonials that detail the results that her consulting services create for her clients.

These are powerful stories that help Vanessa’s clients see their desired future state — and how her firm is the right choice to help them get there.

As you see, our clients have taken our template and made them work for their unique style, clients, and services.

I encourage you to do the same.

And if you’d benefit from personal, 1-on-1 coaching and support from like-minded consultants, check out our Clarity Coaching Program .

Get Help & Feedback Writing Consulting Case Studies

If writing and demonstrating your authority were easy, then every consultant would be publishing case studies.

But that’s not the case.

Sometimes it helps to have a consulting coach to walk you through each step — and a community of like-minded consultants with whom you can share your work and get feedback from.

That’s why we’ve built the Clarity Coaching Program.

Inside the program, we teach you how to write case studies (among dozens of other critical subjects for consulting business founders).

And we’ve also created a network of coaches and other consultants who are in the trenches — and who are willing to share their hard-fought knowledge with you.

Inside the Clarity Coaching program , we’ve helped over 850 consultants to build a more strategic, profitable, and scalable, consulting business.

Learn More About Clarity Coaching

We’ll work hands-on with you to develop a strategic plan and then dive deep and work through your ideal client clarity, strategic messaging, consulting offers, use an effective and proven consulting pricing strategy, help you to increase your fees, business model optimization, and help you to set up your marketing engine and lead generation system to consistently attract ideal clients.

15 thoughts on “ How To Write A Consulting Case Study: Guide, Template, & Examples ”

This is a great outline and I found it quite helpful. Thanks.

Shana – glad you found this post helpful!

I have used case studies to get new clients and you're right, They work.

Jay – thanks for sharing. I've worked with many clients to implement case studies and have used them in several businesses and have always found them to be great at supporting proof and establishing authority and credibility.

Dumb question: guess you can't charge if you're doing a case study, huh?

Terri – No such thing as a dumb question where I come from. Always good to ask.

You definitely can charge for case studies. Michael Stelzner has a lot more information on writing white papers (and case studies) as projects.

This post was really aimed at using case studies to win more business and attract clients. But you can definitely offer this service to companies and they'll pay handsomely for it.

That was a great question!

Hello,I am really glad I stumbled upon your consulting site. This outline is very helpful and I love the e-mails I recieve as well Thanks!

Happy to hear that

This is a great site for consultants – great information for the team to share with consultants that reach out to us. Thank you!

Thanks Deborah

It is a good steps if we know how we start and control our working.

All I wanted to know about putting together a case study I have got. Thanks so much.

to put together your consulting case study: to put together your consulting case study:

I have used your outline today to write one case. Thank you for sharing.

Hi – This is a great piece, and covers all the core elements of a case study with impact.

Couple of extra points…

1. it’s really powerful to provide a mix of qualitative and quantitative results where possible e.g. ‘we saved the client $500 per month and feedback tells us morale improved’

2. We are seeing more and more consultancies include images and video in their case studies. This obviously depends on the context, so while it’s not necessarily appropriate within the confines of a bid, it is definitely something to think about for those case studies that you want to publish online or in a marketing brochure.

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• Case Interview: A comprehensive guide
• Pyramid Principle
• Hypothesis driven structure
• Fit Interview
• Consulting math
• The key to landing your consulting job
• What is a case interview?
• Types of case interview
• How to solve cases with the Problem-Driven Structure?
• What to remember in case interviews
• Case examples or building blocks?
• How do I prepare for case interviews
• Interview day tips
• How we can help

1. The key to landing your consulting job.

Case interviews - where you are asked to solve a business case study under scrutiny - are the core of the selection process right across McKinsey, Bain and BCG (the “MBB” firms). This interview format is also used pretty much universally across other high-end consultancies; including LEK, Kearney, Oliver Wyman and the consulting wings of the “Big Four”.

If you want to land a job at any of these firms, you will have to ace multiple case interviews.

It is increasingly likely that you will also have to solve online cases given by chatbots. You might need to pass these either before making it to interview or be asked to sit them alongside first round interviews.

Importantly, case studies aren’t something you can just wing . Firms explicitly expect you to have thoroughly prepared and many of your competitors on interview day will have been prepping for months.

Don’t worry though - MCC is here to help!

This article will take you through a full overview of everything you’ll need to know to do well, linking to more detailed articles and resources at each stage to let you really drill down into the details.

As well as traditional case interviews, we’ll also attend to the new formats in which cases are being delivered and otherwise make sure you’re up to speed with recent trends in this overall part of consulting recruitment.

Before we can figure out how to prepare for a case interview, though, we will first have to properly understand in detail what exactly you are up against. What format does a standard consulting case interview take? What is expected of you? How will you be assessed?

Let's dive right in and find out!

Professional help

Before going further, if this sounds like a lot to get your head around on your own, don't worry - help is available!

Our Case Academy course gives you everything you need to know to crack cases like a pro:

Case Academy Course

To put what you learn into practice (and secure some savings in the process) you can add mock interview coaching sessions with expereinced MBB consultants:

Coaching options

And, if you just want an experienced consultant to take charge of the whole selection process for you, you can check out our comprehensive mentoring programmes:

Explore mentoring

Now, back to the article!

2. What is a case interview?

Before we can hope to tackle a case interview, we have to understand what one is.

In short, a case interview simulates real consulting work by having you solve a business case study in conversation with your interviewer.

This case study will be a business problem where you have to advise a client - that is, an imaginary business or similar organisation in need of guidance.

You must help this client solve a problem and/or make a decision. This requires you to analyse the information you are given about that client organisation and figure out a final recommendation for what they should do next.

Business problems in general obviously vary in difficulty. Some are quite straightforward and can be addressed with fairly standard solutions. However, consulting firms exist precisely to solve the tough issues that businesses have failed to deal with internally - and so consultants will typically work on complex, idiosyncratic problems requiring novel solutions.

Some examples of case study questions might be:

• How much would you pay for a banking licence in Ghana?
• Estimate the potential value of the electric vehicle market in Germany
• How much gas storage capacity should a UK domestic energy supplier build?

Consulting firms need the brightest minds they can find to put to work on these important, difficult projects. You can expect the case studies you have to solve in interview, then, to echo the unique, complicated problems consultancies deal with every day. As we’ll explain here, this means that you need to be ready to think outside the box to figure out genuinely novel solutions.

2.1. Where are case interviews in the consulting selection process?

Not everyone who applies to a consulting firm will have a case interview - far from it!

In fact, case interviews are pretty expensive and inconvenient for firms to host, requiring them to take consultants off active projects and even fly them back to the office from location for in-person interviews (although this happens less frequently now). Ideally, firms want to cut costs and save time by narrowing down the candidate pool as much as possible before any live interviews.

As such, there are some hoops to jump through before you make it to interview rounds.

Firms will typically eliminate as much as 80% of the applicant pool before interviews start . For most firms, 50%+ of applicants might be cut based on resumes, before a similar cut is made on those remaining based on aptitude tests. McKinsey currently gives their Solve assessment to most applicants, but will use their resulting test scores alongside resumes to cut 70%+ of the candidate pool before interviews.

You'll need to be on top of your game to get as far as a case interview with a top firm. Getting through the resume screen and any aptitude tests is an achievement in itself! Also we need to note that the general timeline of an application can differ depending on a series of factors, including which position you apply, your background, and the office you are applying to. For example, an undergraduate applying for a Business Analyst position (the entry level job at McKinsey) will most likely be part of a recruitment cycle and as such have pretty fixed dates when they need to sit the pre-screening test, and have the first and second round interviews (see more on those below). Conversely, an experienced hire will most likely have a much greater choice of test and interview dates as well as more time at their disposal to prepare.

For readers not yet embroiled in the selection process themselves, let’s put case interviews in context and take a quick look at each stage in turn. Importantly, note that you might also be asked to solve case studies outside interviews as well…

2.1.1. Application screen

It’s sometimes easy to forget that such a large cut is made at the application stage. At larger firms, this will mean your resume and cover letter is looked at by some combination of AI tools, recruitment staff and junior consulting staff (often someone from your own university).

Only the best applications will be passed to later stages, so make sure to check out our free resume and cover letter guides, and potentially get help with editing , to give yourself the best chance possible.

2.1.2. Aptitude tests and online cases

This part of the selection process has been changing quickly in recent years and is increasingly beginning to blur into the traditionally separate case interview rounds.

In the past, GMAT or PST style tests were the norm. Firms then used increasingly sophisticated and often gamified aptitude tests, like the Pymetrics test currently used by several firms, including BCG and Bain, and the original version of McKinsey’s Solve assessment (then branded as the Problem Solving Game).

Now, though, there is a move towards delivering relatively sophisticated case studies online. For example, McKinsey has replaced half the old Solve assessment with an online case. BCG’s Casey chatbot case now directly replaces a live first round case interview, and in the new era of AI chatbots, we expect these online cases to quickly become more realistic and increasingly start to relieve firms of some of the costs of live case interviews.

Our consultants collectively reckon that, over time, 50% of case interviews are likely to be replaced with these kinds of cases . We give some specific advice for online cases in section six. However, the important thing to note is that these are still just simulations of traditional case interviews - you still need to learn how to solve cases in precisely the same way, and your prep will largely remain the same.

2.1.3. Rounds of Interviews

Now, let’s not go overboard with talk of AI. Even in the long term, the client facing nature of consulting means that firms will have live case interviews for as long as they are hiring anyone. And in the immediate term, case interviews are still absolutely the core of consulting selection.

Before landing an offer at McKinsey, Bain, BCG or any similar firm, you won’t just have one case interview, but will have to complete four to six case interviews, usually divided into two rounds, with each interview lasting approximately 50-60 minutes .

Being invited to first round usually means two or three case interviews. As noted above, you might also be asked to complete an online case or similar alongside your first round interviews.

If you ace first round, you will be invited to second round to face the same again, but more gruelling. Only then - after up to six case interviews in total, can you hope to receive an offer.

2.2. Differences between first and second round interviews

Despite case interviews in the first and second round following the same format, second/final round interviews will be significantly more intense . The seniority of the interviewer, time pressure (with up to three interviews back-to-back), and the sheer value of the job at stake will likely make a second round consulting case interview one of the most challenging moments of your professional life.

There are three key differences between the two rounds:

• Time Pressure : Final round case interviews test your ability to perform under pressure, with as many as three interviews in a row and often only very small breaks between them.
• Focus : Since second round interviewers tend to be more senior (usually partners with 12+ years experience) and will be more interested in your personality and ability to handle challenges independently. Some partners will drill down into your experiences and achievements to the extreme. They want to understand how you react to challenges and your ability to identify and learn from past mistakes.
• Psychological Pressure: While case interviews in the first round are usually more focused on you simply cracking the case, second round interviewers often employ a "bad cop" strategy to test the way you react to challenges and uncertainty.

2.3. What skills do case interviews assess?

Reliably impressing your interviewers means knowing what they are looking for. This means understanding the skills you are being assessed against in some detail.

Overall, it’s important always to remember that, with case studies, there are no strict right or wrong answers. What really matters is how you think problems through, how confident you are with your conclusions and how quick you are with the back of the envelope arithmetic.

The objective of this kind of interview isn’t to get to one particular solution, but to assess your skillset. This is even true of modern online cases, where sophisticated AI algorithms score how you work as well as the solutions you generate.

If you visit McKinsey , Bain and BCG web pages on case interviews, you will find that the three firms look for very similar traits, and the same will be true of other top consultancies.

Broadly speaking, your interviewer will be evaluating you across five key areas:

2.1.1.One: Probing mind

Showing intellectual curiosity by asking relevant and insightful questions that demonstrate critical thinking and a proactive nature. For instance, if we are told that revenues for a leading supermarket chain have been declining over the last ten years, a successful candidate would ask:

“ We know revenues have declined. This could be due to price or volume. Do we know how they changed over the same period? ”

This is as opposed to a laundry list of questions like:

• Did customers change their preferences?
• Which segment has shown the decline in volume?
• Is there a price war in the industry?

2.1.2. Structure

Structure in this context means structuring a problem. This, in turn, means creating a framework - that is, a series of clear, sequential steps in order to get to a solution.

As with the case interview in general, the focus with case study structures isn’t on reaching a solution, but on how you get there.

This is the trickiest part of the case interview and the single most common reason candidates fail.

We discuss how to properly structure a case in more detail in section three. In terms of what your interviewer is looking for at high level, though, key pieces of your structure should be:

• Proper understanding of the objective of the case - Ask yourself: "What is the single crucial piece of advice that the client absolutely needs?"
• Identification of the drivers - Ask yourself: "What are the key forces that play a role in defining the outcome?"

Our Problem Driven Structure method, discussed in section three, bakes this approach in at a fundamental level. This is as opposed to the framework-based approach you will find in older case-solving

Focus on going through memorised sequences of steps too-often means failing to develop a full understanding of the case and the real key drivers.

At this link, we run through a case to illustrate the difference between a standard framework-based approach and our Problem Driven Structure method.

2.1.3. Problem Solving

You’ll be tested on your ability to identify problems and drivers, isolate causes and effects, demonstrate creativity and prioritise issues. In particular, the interviewer will look for the following skills:

• Prioritisation - Can you distinguish relevant and irrelevant facts?
• Connecting the dots - Can you connect new facts and evidence to the big picture?
• Establishing conclusions - Can you establish correct conclusions without rushing to inferences not supported by evidence?

2.1.4. Numerical Agility

In case interviews, you are expected to be quick and confident with both precise and approximated numbers. This translates to:

• Performing simple calculations quickly - Essential to solve cases quickly and impress clients with quick estimates and preliminary conclusions.
• Analysing data - Extract data from graphs and charts, elaborate and draw insightful conclusions.
• Solving business problems - Translate a real world case to a mathematical problem and solve it.

Our article on consulting math is a great resource here, though the extensive math content in our MCC Academy is the best and most comprehensive material available.

2.1.5. Communication

Real consulting work isn’t just about the raw analysis to come up with a recommendation - this then needs to be sold to the client as the right course of action.

Similarly, in a case interview, you must be able to turn your answer into a compelling recommendation. This is just as essential to impressing your interviewer as your structure and analysis.

Consultants already comment on how difficult it is to find candidates with the right communication skills. Add to this the current direction of travel, where AI will be able to automate more and more of the routine analytic side of consulting, and communication becomes a bigger and bigger part of what consultants are being paid for.

So, how do you make sure that your recommendations are relevant, smart, and engaging? The answer is to master what is known as CEO-level communication .

This art of speaking like a CEO can be quite challenging, as it often involves presenting information in effectively the opposite way to how you might normally.

To get it right, there are three key areas to focus on in your communications:

• Top down : A CEO wants to hear the key message first. They will only ask for more details if they think that will actually be useful. Always consider what is absolutely critical for the CEO to know, and start with that. You can read more in our article on the Pyramid Principle .
• Concise : This is not the time for "boiling the ocean" or listing an endless number possible solutions. CEOs, and thus consultants, want a structured, quick and concise recommendation for their business problem, that they can implement immediately.
• Fact-based : Consultants share CEOs' hatred of opinions based on gut feel rather than facts. They want recommendations based on facts to make sure they are actually in control. Always go on to back up your conclusions with the relevant facts.

Being concise and to the point is key in many areas, networking being one for them. For more detail on all this, check out our full article on delivering recommendations .

Prep the right way

3. types of case interview.

While most case interviews share a similar structure, firms will have some differences in the particular ways they like to do things in terms of both the case study and the fit component.

As we’ll see, these differences aren’t hugely impactful in terms of how you prepare. That said, it's always good to know as much as possible about what you will be going up against.

3.1. Different case objectives

A guiding thread throughout this article and our approach in general will be to treat each case as a self-contained problem and not try to pigeonhole it into a certain category. Having said that, there are of course similarities between cases and we can identify certain parameters and objectives.

Broadly speaking, cases can be divided into issue-based cases and strategic decision cases. In the former you will be asked to solve a certain issue, such as declining profits, or low productivity whereas in the latter you will be ask whether your client should or should not do something, such as enter a specific market or acquire another company. The chart below is a good breakdown of these different objectives:

3.2. How do interviewers craft cases

While interviewers will very likely be given a case bank to choose from by their company, a good number of them will also choose to adapt the cases they would currently be working on to a case interview setting. The difference is that the latter cases will be harder to pigeonhole and apply standard frameworks to, so a tailored approach will be paramount.

If you’ve applied for a specific practice or type of consulting - such as operational consulting, for example - it’s very likely that you will receive a case geared towards that particular area alongside a ‘generalist’ consulting case (however, if that’s the case, you will generally be notified). The other main distinction when it comes to case interviews is between interviewer-led and candidate-led.

3.3. Candidate-led cases

Most consulting case interview questions test your ability to crack a broad problem, with a case prompt often going something like:

" How much would you pay to secure the rights to run a restaurant in the British Museum? "

You, as a candidate, are then expected to identify your path to solve the case (that is, provide a structure), leveraging your interviewer to collect the data and test your assumptions.

This is known as a “candidate-led” case interview and is used by Bain, BCG and other firms. From a structuring perspective, it’s easier to lose direction in a candidate-led case as there are no sign-posts along the way. As such, you need to come up with an approach that is both broad enough to cover all of the potential drivers in a case but also tailored enough to the problem you are asked to solve. It’s also up to you to figure out when you need to delve deeper into a certain branch of the case, brainstorm or ask for data. The following case from Bain is an excellent example on how to navigate a candidate-led case.

3.4. Interviewer-led cases

This type of case - employed most famously by McKinsey - is slightly different, with the interviewer controlling the pace and direction of the conversation much more than with other case interviews.

At McKinsey, your interviewer will ask you a set of pre-determined questions, regardless of your initial structure. For each question, you will have to understand the problem, come up with a mini structure, ask for additional data (if necessary) and come to the conclusion that answers the question. This more structured format of case also shows up in online cases by other firms - notably including BCG’s Casey chatbot (with the amusing result that practising McKinsey-style cases can be a great addition when prepping for BCG).

Essentially, these interviewer-led case studies are large cases made up of lots of mini-cases. You still use basically the same method as you would for standard (or candidate-led) cases - the main difference is simply that, instead of using that method to solve one big case, you are solving several mini-cases sequentially. These cases are easier to follow as the interviewer will guide you in the right direction. However, this doesn’t mean you should pay less attention to structure and deliver a generic framework! Also, usually (but not always!) the first question will ask you to map your approach and is the equivalent of the structuring question in candidate-led cases. Sometimes, if you’re missing key elements, the interviewer might prompt you in the right direction - so make sure to take those prompts seriously as they are there to help you get back on track (ask for 30 seconds to think on the prompt and structure your approach). Other times - and this is a less fortunate scenario - the interviewer might say nothing and simply move on to the next question. This is why you should put just as much thought (if not more) into the framework you build for interviewer-led cases , as you may be penalized if you produce something too generic or that doesn’t encompass all the issues of the case.

3.5. Case and fit

The standard case interview can be thought of as splitting into two standalone sub-interviews. Thus “case interviews” can be divided into the case study itself and a “fit interview” section, where culture fit questions are asked.

This can lead to a bit of confusion, as the actual case interview component might take up as little as half of your scheduled “case interview”. You need to make sure you are ready for both aspects.

To illustrate, here is the typical case interview timeline:

• First 15-30 minutes: Fit Interview - with questions assessing your motivation to be a consultant in that specific firm and your traits around leadership and teamwork. Learn more about the fit interview in our in-depth article here .
• Next 30-40 minutes: Case Interview - solving a case study
• Last 5 minutes: Fit Interview again - this time focussing on your questions for your interviewer.

Both the Case and Fit interviews play crucial roles in the finial hiring decision. There is no “average” taken between case and fit interviews: if your performance is not up to scratch in either of the two, you will not be able to move on to the next interview round or get an offer.

NB: No case without fit

Note that, even if you have only been told you are having a case interview or otherwise are just doing a case study, always be prepared to answer fit questions. At most firms, it is standard practice to include some fit questions in all case interviews, even if there are also separate explicit fit interviews, and interviewers will almost invariably include some of these questions around your case. This is perfectly natural - imagine how odd and artificial it would be to show up to an interview, simply do a case and leave again, without talking about anything else with the interviewer before or after.

3.5.1 Differences between firms

For the most part, a case interview is a case interview. However, firms will have some differences in the particular ways they like to do things in terms of both the case study and the fit component.

3.5.2. The McKinsey PEI

McKinsey brands its fit aspect of interviews as the Personal Experience Interview or PEI. Despite the different name, this is really much the same interview you will be going up against in Bain, BCG and any similar firms.

McKinsey does have a reputation for pushing candidates a little harder with fit or PEI questions , focusing on one story per interview and drilling down further into the specific details each time. We discuss this tendency more in our fit interview article . However, no top end firm is going to go easy on you and you should absolutely be ready for the same level of grilling at Bain, BCG and others. Thus any difference isn’t hugely salient in terms of prep.

3.6. What is different in 2023?

For the foreseeable future, you are going to have to go through multiple live case interviews to secure any decent consulting job. These might increasingly happen via Zoom rather than in person, but they should remain largely the same otherwise.

However, things are changing and the rise of AI in recent months seems pretty much guaranteed to accelerate existing trends.

Even before the explosive development of AI chatbots like ChatGPT we have seen in recent months, automation was already starting to change the recruitment process.

As we mentioned, case interviews are expensive and inconvenient for firms to run . Ideally, then, firms will try to reduce the number of interviews required for recruitment as far as possible. For many years, tests of various kinds served to cut down the applicant pool and thus the number of interviews. However, these tests had a limited capacity to assess candidates against the full consulting skillset in the way that case interviews do so well.

More recently, though, the development of online testing has allowed for more and more advanced assessments. Top consulting firms have been leveraging screening tests that better and better capture the same skillset as case interviews. Eventually this is converging on automated case studies. We see this very clearly with the addition of the Redrock case to McKinsey’s Solve assessment.

As these digital cases become closer to the real thing, the line between test and case interview blurs. Online cases don’t just reduce the number of candidates to case interview, but start directly replacing them.

Case in point here is BCG’s Casey chatbot . Previously, BCG had deployed less advanced online cases and similar tests to weed out some candidates before live case interviews began. Now, though, Casey actually replaces one first round case interview.

Casey, at time of writing, is still a relatively “basic” chatbot, basically running through a pre-set script. The Whatsapp-like interface does a lot of work to make it feel like one is chatting to a “real person” - the chatbot itself, though, cannot provide feedback or nudges to candidates as would a human interviewer.

We fully expect that, as soon as BCG and other firms can train a truer AI, these online cases will become more widespread and start replacing more live interviews.

We discuss the likely impacts of advanced AI on consulting recruitment and the industry more broadly in our blog.

Here, though, the real message is that you should expect to run into digital cases as well as traditional case interviews.

Luckily, despite any changes in specific case interview format, you will still need to master the same fundamental skills and prepare in much the same way.

We’ll cover a few ways to help prepare for chatbot cases in section four. Ultimately, though, firms are looking for the same problem solving ability and mindset as a real interviewer. Especially as chatbots get better at mimicking a real interviewer, candidates who are well prepared for case cracking in general should have no problem with AI administered cases.

3.6.1. Automated fit interviews

Analogous to online cases, in recent years there has been a trend towards automated, “one way” fit interviews, with these typically being administered for consultancies by specialist contractors like HireVue or SparkHire.

These are kind of like Zoom interviews, but if the interviewer didn’t show up. Instead you will be given fit questions to answer and must record your answer in your computer webcam. Your response will then go on to be assessed by an algorithm, scoring both what you say and how you say it.

Again, with advances in AI, it is easy to imagine these automated case interviews going from fully scripted interactions, where all candidates are asked the same list of questions, to a more interactive experience. Thus, we might soon arrive at a point where you are being grilled on the details of your stories - McKinsey PEI style - but by a bot rather than a human.

We include some tips on this kind of “one way” fit interview in section six here.

4. How to solve cases with the Problem-Driven Structure?

If you look around online for material on how to solve case studies, a lot of what you find will set out framework-based approaches. However, as we have mentioned, these frameworks tend to break down with more complex, unique cases - with these being exactly the kind of tough case studies you can expect to be given in your case interviews.

To address this problem, the MyConsultingCoach team has synthesized a new approach to case cracking that replicates how top management consultants approach actual engagements.

MyConsultingCoach’s Problem Driven Structure approach is a universal problem solving method that can be applied to any business problem , irrespective of its nature.

As opposed to just selecting a generic framework for each case interview, the Problem Driven Structure approach works by generating a bespoke structure for each individual question and is a simplified version of the roadmap McKinsey consultants use when working on engagements.

The canonical seven steps from McKinsey on real projects are simplified to four for case interview questions, as the analysis required for a six-month engagement is somewhat less than that needed for a 45-minute case study. However, the underlying flow is the same (see the method in action in the video below)

Let's zoom in to see how our method actually works in more detail:

4.1. Identify the problem

Identifying the problem means properly understanding the prompt/question you are given, so you get to the actual point of the case.

This might sound simple, but cases are often very tricky, and many candidates irretrievably mess things up within the first few minutes of starting. Often, they won’t notice this has happened until they are getting to the end of their analysis. Then, they suddenly realise that they have misunderstood the case prompt - and have effectively been answering the wrong question all along!

With no time to go back and start again, there is nothing to do. Even if there were time, making such a silly mistake early on will make a terrible impression on their interviewer, who might well have written them off already. The interview is scuppered and all the candidate’s preparation has been for nothing.

This error is so galling as it is so readily avoidable.

Our method prevents this problem by placing huge emphasis on a full understanding of the case prompt. This lays the foundations for success as, once we have identified the fundamental, underlying problem our client is facing, we focus our whole analysis around finding solutions to this specific issue.

Now, some case interview prompts are easy to digest. For example, “Our client, a supermarket, has seen a decline in profits. How can we bring them up?”. However, many of the prompts given in interviews for top firms are much more difficult and might refer to unfamiliar business areas or industries. For example, “How much would you pay for a banking license in Ghana?” or “What would be your key areas of concern be when setting up an NGO?”

Don’t worry if you have no idea how you might go about tackling some of these prompts!

In our article on identifying the problem and in our full lesson on the subject in our MCC Academy course, we teach a systematic, four step approach to identifying the problem , as well as running through common errors to ensure you start off on the right foot every time!

This is summarised here:

Following this method lets you excel where your competitors mess up and get off to a great start in impressing your interviewer!

4.2. Build your problem driven structure

After you have properly understood the problem, the next step is to successfully crack a case is to draw up a bespoke structure that captures all the unique features of the case.

This is what will guide your analysis through the rest of the case study and is precisely the same method used by real consultants working on real engagements.

Of course, it might be easier here to simply roll out one an old-fashioned framework, and a lot of candidates will do so. This is likely to be faster at this stage and requires a lot less thought than our problem-driven structure approach.

However, whilst our problem driven structure approach requires more work from you, our method has the advantage of actually working in the kind of complex case studies where generic frameworks fail - that is exactly the kind of cases you can expect at an MBB interview .

Since we effectively start from first principles every time, we can tackle any case with the same overarching method. Simple or complex, every case is the same to you and you don’t have to gamble a job on whether a framework will actually work

4.2.1 Issue trees

Issue trees break down the overall problem into a set of smaller problems that you can then solve individually. Representing this on a diagram also makes it easy for both you and your interviewer to keep track of your analysis.

To see how this is done, let’s look at the issue tree below breaking down the revenues of an airline:

These revenues can be segmented as the number of customers multiplied by the average ticket price. The number of customers can be further broken down into a number of flights multiplied by the number of seats, times average occupancy rate. The node corresponding to the average ticket price can then be segmented further.

4.2.2 Hypothesis trees

Hypothesis trees are similar, the only difference being that rather than just trying to break up the issue into smaller issues you are assuming that the problem can be solved and you are formulating solutions.

In the example above, you would assume revenues can be increased by either increasing the average ticket price or the number of customers . You can then hypothesize that you can increase the average occupancy rate in three ways: align the schedule of short and long haul flights, run a promotion to boost occupancy in off-peak times, or offer early bird discounts.

4.2.3 Other structures:structured lists

Structured lists are simply subcategories of a problem into which you can fit similar elements. This McKinsey case answer starts off by identifying several buckets such as retailer response, competitor response, current capabilities and brand image and then proceeds to consider what could fit into these categories.

Buckets can be a good way to start the structure of a complex case but when using them it can be very difficult to be MECE and consistent, so you should always aim to then re-organize them into either an issue or a hypothesis tree.

It is worth noting that the same problem can be structured in multiple valid ways by choosing different means to segment the key issues. Ultimately all these lists are methods to set out a logical hierachy among elements.

4.2.4 Structures in practice

That said, not all valid structures are equally useful in solving the underlying problem. A good structure fulfils several requirements - including MECE-ness , level consistency, materiality, simplicity, and actionability. It’s important to put in the time to master segmentation, so you can choose a scheme isn’t only valid, but actually useful in addressing the problem.

After taking the effort to identify the problem properly, an advantage of our method is that it will help ensure you stay focused on that same fundamental problem throughout. This might not sound like much, but many candidates end up getting lost in their own analysis, veering off on huge tangents and returning with an answer to a question they weren’t asked.

Another frequent issue - particularly with certain frameworks - is that candidates finish their analysis and, even if they have successfully stuck to the initial question, they have not actually reached a definite solution. Instead, they might simply have generated a laundry list of pros and cons, with no clear single recommendation for action.

Clients employ consultants for actionable answers, and this is what is expected in the case interview. The problem driven structure excels in ensuring that everything you do is clearly related back to the key question in a way that will generate a definitive answer. Thus, the problem driven structure builds in the hypothesis driven approach so characteristic of real consulting practice.

You can learn how to set out your own problem driven structures in our article here and in our full lesson in the MCC Academy course.

4.2. Lead the analysis

A problem driven structure might ensure we reach a proper solution eventually, but how do we actually get there?

We call this step " leading the analysis ", and it is the process whereby you systematically navigate through your structure, identifying the key factors driving the issue you are addressing.

Generally, this will mean continuing to grow your tree diagram, further segmenting what you identify as the most salient end nodes and thus drilling down into the most crucial factors causing the client’s central problem.

Once you have gotten right down into the detail of what is actually causing the company’s issues, solutions can then be generated quite straightforwardly.

To see this process in action, we can return to our airline revenue example:

Let’s say we discover the average ticket price to be a key issue in the airline’s problems. Looking closer at the drivers of average ticket price, we find that the problem lies with economy class ticket prices. We can then further segment that price into the base fare and additional items such as food.

Having broken down the issue to such a fine-grained level and considering the 80/20 rule(see below), solutions occur quite naturally. In this case, we can suggest incentivising the crew to increase onboard sales, improving assortment in the plane, or offering discounts for online purchases.

Our article on leading the analysis is a great primer on the subject, with our video lesson in the MCC Academy providing the most comprehensive guide available.

4.4. Provide recommendations

So you have a solution - but you aren’t finished yet!

Now, you need to deliver your solution as a final recommendation.

This should be done as if you are briefing a busy CEO and thus should be a one minute, top-down, concise, structured, clear, and fact-based account of your findings.

The brevity of the final recommendation belies its importance. In real life consulting, the recommendation is what the client has potentially paid millions for - from their point of view, it is the only thing that matters.

In a case interview, your performance in this final summing up of your case is going to significantly colour your interviewer’s parting impression of you - and thus your chances of getting hired!

So, how do we do it right?

Barbara Minto's Pyramid Principle elegantly sums up almost everything required for a perfect recommendation. The answer comes first , as this is what is most important. This is then supported by a few key arguments , which are in turn buttressed by supporting facts .

Across the whole recommendation, the goal isn’t to just summarise what you have done. Instead, you are aiming to synthesize your findings to extract the key "so what?" insight that is useful to the client going forward.

All this might seem like common sense, but it is actually the opposite of how we relay results in academia and other fields. There, we typically move from data, through arguments and eventually to conclusions. As such, making good recommendations is a skill that takes practice to master.

We can see the Pyramid Principle illustrated in the diagram below:

To supplement the basic Pyramid Principle scheme, we suggest candidates add a few brief remarks on potential risks and suggested next steps . This helps demonstrate the ability for critical self-reflection and lets your interviewer see you going the extra mile.

The combination of logical rigour and communication skills that is so definitive of consulting is particularly on display in the final recommendation.

Despite it only lasting 60 seconds, you will need to leverage a full set of key consulting skills to deliver a really excellent recommendation and leave your interviewer with a good final impression of your case solving abilities.

Our specific article on final recommendations and the specific video lesson on the same topic within our MCC Academy are great, comprehensive resources. Beyond those, our lesson on consulting thinking and our articles on MECE and the Pyramid Principle are also very useful.

4.5. What if I get stuck?

Naturally with case interviews being difficult problems there may be times where you’re unsure what to do or which direction to take. The most common scenario is that you will get stuck midway through the case and there are essentially two things that you should do:

• 1. Go back to your structure
• 2. Ask the interviewer for clarification

Your structure should always be your best friend - after all, this is why you put so much thought and effort into it: if it’s MECE it will point you in the right direction. This may seem abstract but let’s take the very simple example of a profitability case interview: if you’ve started your analysis by segmenting profit into revenue minus costs and you’ve seen that the cost side of the analysis is leading you nowhere, you can be certain that the declining profit is due to a decline in revenue.

Similarly, when you’re stuck on the quantitative section of the case interview, make sure that your framework for calculations is set up correctly (you can confirm this with the interviewer) and see what it is you’re trying to solve for: for example if you’re trying to find what price the client should sell their new t-shirt in order to break even on their investment, you should realize that what you’re trying to find is the break even point, so you can start by calculating either the costs or the revenues. You have all the data for the costs side and you know they’re trying to sell 10.000 pairs so you can simply set up the equation with x being the price.

As we’ve emphasised on several occasions, your case interview will be a dialogue. As such, if you don’t know what to do next or don’t understand something, make sure to ask the interviewer (and as a general rule always follow their prompts as they are trying to help, not trick you). This is especially true for the quantitative questions, where you should really understand what data you’re looking at before you jump into any calculations. Ideally you should ask your questions before you take time to formulate your approach but don’t be afraid to ask for further clarification if you really can’t make sense of what’s going on. It’s always good to walk your interviewer through your approach before you start doing the calculations and it’s no mistake to make sure that you both have the same understanding of the data. For example when confronted with the chart below, you might ask what GW (in this case gigawatt) means from the get-go and ask to confirm the different metrics (i.e. whether 1 GW = 1000 megawatts). You will never be penalised for asking a question like that.

5. What to remember in case interviews

If you’re new to case cracking you might feel a bit hopeless when you see a difficult case question, not having any idea where to start.

In fact though, cracking case interviews is much like playing chess. The rules you need to know to get started are actually pretty simple. What will make you really proficient is time and practice.

In this section, we’ll run through a high level overview of everything you need to know, linking to more detailed resources at every step.

5.1. An overall clear structure

You will probably hear this more than you care for but it is the most important thing to keep in mind as you start solving cases, as not only it is a key evaluation criterion but the greatest tool you will have at your disposal. The ability to build a clear structure in all aspects of the case inteview will be the difference between breezing through a complicated case and struggling at its every step. Let’s look a bit closer at the key areas where you should be structured!

5.1.1 Structured notes

Every case interview starts with a prompt, usually verbal, and as such you will have to take some notes. And here is where your foray into structure begins, as the notes you take should be clear, concise and structured in a way that will allow you to repeat the case back to the interviewer without writing down any unnecessary information.

This may sound very basic but you should absolutely not be dismissive about it: taking clear and organized notes will allow what we found helps is to have separate sections for:

• The case brief
• Follow-up questions and answers
• Numerical data
• Case structure (the most crucial part when solving the case)
• Any scrap work during the case (usually calculations)

When solving the case - or, as we call it here, in the Lead the analysis step, it is highly recommended to keep on feeding and integrating your structure, so that you never get lost. Maintaining a clear high level view is one of the most critical aspects in case interviews as it is a key skill in consulting: by constantly keeping track of where you are following your structure, you’ll never lose your focus on the end goal.

In the case of an interviewer-led case, you can also have separate sheets for each question (e.g. Question 1. What factors can we look at that drive profitability?). If you develop a system like this you’ll know exactly where to look for each point of data rather than rummage around in untidy notes. There are a couple more sections that you may have, depending on preference - we’ll get to these in the next sections.

5.1.2 Structured communication

There will be three main types of communication in cases:

• 1. Asking and answering questions
• 2. Walking the interviewer through your structure (either the case or calculation framework - we’ll get to that in a bit!)
• 3. Delivering your recommendation

Asking and answering questions will be the most common of these and the key thing to do before you speak is ask for some time to collect your thoughts and get organised. What you want to avoid is a ‘laundry list’ of questions or anything that sounds too much like a stream of consciousness.

Different systems work for different candidates but a sure-fire way of being organised is numbering your questions and answers. So rather than saying something like ‘I would like to ask about the business model, operational capacity and customer personas’ it’s much better to break it down and say something along the lines of ‘I’ve got three key questions. Firstly I would like to inquire into the business model of our client. Secondly I would like to ask about their operational capacity. Thirdly I would like to know more about the different customer personas they are serving’.

A similar principle should be applied when walking the interviewer through your structure, and this is especially true of online case interviews (more and more frequent now) when the interviewer can’t see your notes. Even if you have your branches or buckets clearly defined, you should still use a numbering system to make it obvious to the interviewer. So, for example, when asked to identify whether a company should make an acquisition, you might say ‘I would like to examine the following key areas. Firstly the financial aspects of this issue, secondly the synergies and thirdly the client’s expertise’

The recommendation should be delivered top-down (see section 4.4 for specifics) and should employ the same numbering principle. To do so in a speedy manner, you should circle or mark the key facts that you encounter throughout the case so you can easily pull them out at the end.

5.1.3 Structured framework

It’s very important that you have a systematic approach - or framework - for every case. Let’s get one thing straight: there is a difference between having a problem-solving framework for your case and trying to force a case into a predetermined framework. Doing the former is an absolute must , whilst doing the latter will most likely have you unceremoniously dismissed.

We have seen there are several ways of building a framework, from identifying several categories of issues (or ‘buckets’) to building an issue or hypothesis tree (which is the most efficient type of framework). For the purpose of organization, we recommend having a separate sheet for the framework of the case, or, if it’s too much to manage, you can have it on the same sheet as the initial case prompt. That way you’ll have all the details as well as your proposed solution in one place.

5.1.4 Structured calculations

Whether it’s interviewer or candidate-led, at some point in the case you will get a bunch of numerical data and you will have to perform some calculations (for the specifics of the math you’ll need on consulting interviews, have a look at our Consulting Math Guide ). Here’s where we urge you to take your time and not dive straight into calculating! And here’s why: while your numerical agility is sure to impress interviewers, what they’re actually looking for is your logic and the calculations you need to perform in order to solve the problem . So it’s ok if you make a small mistake, as long as you’re solving for the right thing.

As such, make it easy for them - and yourself. Before you start, write down in steps the calculations you need to perform. Here’s an example: let’s say you need to find out by how much profits will change if variable costs are reduced by 10%. Your approach should look something like:

• 1. Calculate current profits: Profits = Revenues - (Variable costs + Fixed costs)
• 2. Calculate the reduction in variable costs: Variable costs x 0.9
• 3. Calculate new profits: New profits = Revenues - (New variable costs + Fixed costs)

Of course, there may be more efficient ways to do that calculation, but what’s important - much like in the framework section - is to show your interviewer that you have a plan, in the form of a structured approach. You can write your plan on the sheet containing the data, then perform the calculations on a scrap sheet and fill in the results afterward.

5.2. Common business knowledge and formulas

Although some consulting firms claim they don’t evaluate candidates based on their business knowledge, familiarity with basic business concepts and formulae is very useful in terms of understanding the case studies you are given in the first instance and drawing inspiration for structuring and brainstorming.

If you are coming from a business undergrad, an MBA or are an experienced hire, you might well have this covered already. For those coming from a different background, it may be useful to cover some.

Luckily, you don’t need a degree-level understanding of business to crack case interviews , and a lot of the information you will pick up by osmosis as you read through articles like this and go through cases.

However, some things you will just need to sit down and learn. We cover everything you need to know in some detail in our Case Academy Course course. However, some examples here of things you need to learn are:

• Basic accounting (particularly how to understand all the elements of a balance sheet)
• Basic economics
• Basic marketing
• Basic strategy

Below we include a few elementary concepts and formulae so you can hit the ground running in solving cases. We should note that you should not memorise these and indeed a good portion of them can be worked out logically, but you should have at least some idea of what to expect as this will make you faster and will free up much of your mental computing power. In what follows we’ll tackle concepts that you will encounter in the private business sector as well as some situations that come up in cases that feature clients from the NGO or governmental sector.

5.2.1 Business sector concepts

These concepts are the bread and butter of almost any business case so you need to make sure you have them down. Naturally, there will be specificities and differences between cases but for the most part here is a breakdown of each of them.

5.2.1.1. Revenue

The revenue is the money that the company brings in and is usually equal to the number of products they sell multiplied to the price per item and can be expressed with the following equation:

Revenue = Volume x Price

Companies may have various sources of revenue or indeed multiple types of products, all priced differently which is something you will need to account for in your case interview. Let’s consider some situations. A clothing company such as Nike will derive most of their revenue from the number of products they sell times the average price per item. Conversely, for a retail bank revenue is measured as the volume of loans multiplied by the interest rate at which the loans are given out. As we’ll see below, we might consider primary revenues and ancillary revenues: in the case of a football club, we might calculate primary revenues by multiplying the number of tickets sold by the average ticket price, and ancillary revenues those coming from sales of merchandise (similarly, let’s say average t-shirt price times the number of t-shirts sold), tv rights and sponsorships.

These are but a few examples and another reminder that you should always aim to ask questions and understand the precise revenue structure of the companies you encounter in cases.

5.2.1.2. Costs

The costs are the expenses that a company incurs during its operations. Generally, they can be broken down into fixed and variable costs :

Costs = Fixed Costs + Variable Costs

As their name implies, fixed costs do not change based on the number of units produced or sold. For example, if you produce shoes and are renting the space for your factory, you will have to pay the rent regardless of whether you produce one pair or 100. On the other hand, variable costs depend on the level of activity, so in our shoe factory example they would be equivalent to the materials used to produce each pair of shoes and would increase the more we produce.

These concepts are of course guidelines used in order to simplify the analysis in cases, and you should be aware that in reality often the situation can be more complicated. However, this should be enough for case interviews. Costs can also be quasi-fixed, in that they increase marginally with volume. Take the example of a restaurant which has a regular staff, incurring a fixed cost but during very busy hours or periods they also employ some part-time workers. This cost is not exactly variable (as it doesn’t increase with the quantity of food produced) but also not entirely fixed, as the number of extra hands will depend on how busy the restaurant is. Fixed costs can also be non-linear in nature. Let’s consider the rent in the same restaurant: we would normally pay a fixed amount every month, but if the restaurant becomes very popular we might need to rent out some extra space so the cost will increase. Again, this is not always relevant for case interviews.

5.2.1.3. Profit and profit margin

The profit is the amount of money a company is left with after it has paid all of its expenses and can be expressed as follows:

Profit = Revenue - Costs

It’s very likely that you will encounter a profitability issue in one of your case interviews, namely you will be asked to increase a company’s profit. There are two main ways of doing this: increasing revenues and reducing costs , so these will be the two main areas you will have to investigate. This may seem simple but what you will really need to understand in a case are the key drivers of a business (and this should be done through clarifying questions to the interviewer - just as a real consultant would question their client).

For example, if your client is an airline you can assume that the main source of revenue is sales of tickets, but you should inquire how many types of ticket the specific airline sells. You may naturally consider economy and business class tickets, but you may find out that there is a more premium option - such as first class - and several in-between options. Similarly to our football club example, there may be ancillary revenues from selling of food and beverage as well as advertising certain products or services on flights.

You may also come across the profit margin in case interviews. This is simply the percentage of profit compared to the revenue and can be expressed as follows:

Profit margin = Profit/Revenue x 100

5.2.1.4. Break-even point

An ancillary concept to profit, the break-even point is the moment where revenues equal costs making the profit zero and can be expressed as the following equation:

Revenues = Costs (Fixed costs + Variable costs)

This formula will be useful when you are asked questions such as ‘What is the minimum price I should sell product X?’ or ‘What quantity do I need to sell in order to recoup my investment?’. Let’s say in a case interview an owner of a sandwich store asks us to figure out how many salami and cheese salami sandwiches she needs to sell in order to break even. She’s spending $4 on salami and $2 for cheese and lettuce per sandwich, and believes she can sell the sandwiches at around $7. The cost of utilities and personnel is around $5000 per month. We could lay this all out in the break-even equation:

7 x Q ( quantity ) = (4+2) x Q + 5000 ( variable + fixed costs )

In a different scenario, we may be asked to calculate the break-even price . Let’s consider our sandwich example and say our owner knows she has enough ingredients for about 5000 sandwiches per month but is not sure how much to sell them for. In that case, if we know our break-even equation, we can simply make the following changes:

P ( price ) x 5000 = (4+2) x 5000 + 5000

By solving the equation we get to the price of $7 per sandwich.

5.2.1.5. Market share and market size

We can also consider the market closely with profit, as in fact the company’s performance in the market is what drives profits. The market size is the total number of potential customers for a certain business or product, whereas the market share is the percentage of that market that your business controls (or could control, depending on the case).

There is a good chance you will have to estimate the market size in one of your case interviews and we get into more details on how to do that below. You may be asked to estimate this in either number of potential customers or total value . The latter simply refers to the number of customers multiplied by the average value of the product or service.

To calculate the market share you will have to divide the company’s share by the total market size and multiply by 100:

Note, though, that learning the very basics of business is the beginning rather than the end of your journey. Once you are able to “speak business” at a rudimentary level, you should try to “become fluent” and immerse yourself in reading/viewing/listening to as wide a variety of business material as possible, getting a feel for all kinds of companies and industries - and especially the kinds of problems that can come up in each context and how they are solved. The material put out by the consulting firms themselves is a great place to start, but you should also follow the business news and find out about different companies and sectors as much as possible between now and interviews. Remember, if you’re going to be a consultant, this should be fun rather than a chore!

5.3 Public sector and NGO concepts

As we mentioned, there will be some cases (see section 6.6 for a more detailed example) where the key performance indicators (or KPIs in short) will not be connected to profit. The most common ones will involve the government of a country or an NGO, but they can be way more diverse and require more thought and application of first principles. We have laid out a couple of the key concepts or KPIs that come up below

5.3.1 Quantifiability

In many such scenarios you will be asked to make an important strategic decision of some kind or to optimise a process. Of course these are not restricted to non-private sector cases but this is where they really come into their own as there can be great variation in the type of decision and the types of field.

While there may be no familiar business concepts to anchor yourself onto, a concept that is essential is quantifiability . This means, however qualitative the decision might seem, consultants rely on data so you should always aim to have aspects of a decision that can be quantified, even if the data doesn’t present itself in a straightforward manner.

Let’s take a practical example. Your younger sibling asks you to help them decide which university they should choose if they want to study engineering. One way to structure your approach would be to segment the problem into factors affecting your sibling’s experience at university and experience post-university. Within the ‘at uni’ category you might think about the following:

• Financials : How much are tuition costs and accommodation costs?
• Quality of teaching and research : How are possible universities ranked in the QS guide based on teaching and research?
• Quality of resources : How well stocked is their library, are the labs well equipped etc.?
• Subject ranking : How is engineering at different unis ranked?
• Life on campus and the city : What are the living costs in the city where the university is based? What are the extracurricular opportunities and would your sibling like to live in that specific city based on them?

Within the ‘out of uni’ category you might think about:

• Exit options : What are the fields in which your sibling could be employed and how long does it take the average student of that university to find a job?
• Alumni network : What percentage of alumni are employed by major companies?
• Signal : What percentage of applicants from the university get an interview in major engineering companies and related technical fields?

You will perhaps notice that all the buckets discussed pose quantifiable questions meant to provide us with data necessary to make a decision. It’s no point to ask ‘Which university has the nicest teaching staff?’ as that can be a very subjective metric.

5.3.1 Impact

Another key concept to consider when dealing with sectors other than the private one is how impactful a decision or a line of inquiry is on the overarching issue , or whether all our branches in our issue tree have a similar impact. This can often come in the form of impact on lives, such as in McKinsey’s conservation case discussed below, namely how many species can we save with our choice of habitat.

5.4 Common consulting concepts

Consultants use basic business concepts on an every day basis, as they help them articulate their frameworks to problems. However, they also use some consulting specific tools to quality check their analysis and perform in the most efficient way possible. These principles can be applied to all aspects of a consultant’s work, but for brevity we can say they mostly impact a consultant’s systematic approach and communication - two very important things that are also tested in case interviews. Therefore, it’s imperative that you not only get to know them, but learn how and when to use them as they are at the very core of good casing. They are MECE-ness, the Pareto Principle and the Pyramid principle and are explained briefly below - you should, however, go on to study them in-depth in their respective articles.

Perhaps the central pillar of all consulting work and an invaluable tool to solve cases, MECE stands for Mutually Exclusive and Collectively Exhaustive . It can refer to any and every aspect in a case but is most often used when talking about structure. We have a detailed article explaining the concept here , but the short version is that MECE-ness ensures that there is no overlap between elements of a structure (i.e. the Mutually Exclusive component) and that it covers all the drivers or areas of a problem (Collectively Exhaustive). It is a concept that can be applied to any segmentation when dividing a set into subsets that include it wholly but do not overlap.

Let’s take a simple example and then a case framework example. In simple terms, when we are asked to break down the set ‘cars’ into subsets, dividing cars into ‘red cars’ and ‘sports cars’ is neither mutually exclusive (as there are indeed red sports cars) nor exhaustive of the whole set (i.e. there are also yellow non-sports cars that are not covered by this segmentation). A MECE way to segment would be ‘cars produced before 2000’ and ‘cars produced after 2000’ as this segmentation allows for no overlap and covers all the cars in existence.

Dividing cars can be simple, but how can we ensure MECEness in a case-interview a.k.a. a business situation. While the same principles apply, a good tip to ensure that your structure is MECE is to think about all the stakeholders - i.e. those whom a specific venture involves.

Let’s consider that our client is a soda manufacturer who wants to move from a business-to-business strategy, i.e. selling to large chains of stores and supermarkets, to a business-to-consumer strategy where it sells directly to consumers. In doing so they would like to retrain part of their account managers as direct salespeople and need to know what factors to consider.

A stakeholder-driven approach would be to consider the workforce and customers and move further down the issue tree, thinking about individual issues that might affect them. In the case of the workforce, we might consider how the shift would affect their workload and whether it takes their skillset into account. As for the customers, we might wonder whether existing customers would be satisfied with this move: will the remaining B2B account managers be able to provide for the needs of all their clients and will the fact that the company is selling directly to consumers now not cannibalise their businesses? We see how by taking a stakeholder-centred approach we can ensure that every single perspective and potential issue arising from it is fully covered.

5.4.2 The Pareto Principle

Also known as the 80/20 rule, this principle is important when gauging the impact of a decision or a factor in your analysis. It simply states that in business (but not only) 80% of outcomes come from 20% of causes. What this means is you can make a few significant changes that will impact most of your business organisation, sales model, cost structure etc.

Let’s have a look at 3 quick examples to illustrate this:

• 80% of all accidents are caused by 20% of drivers
• 20% of a company’s products account for 80% of the sales
• 80% of all results in a company are driven by 20% of its employees

The 80/20 rule will be a very good guide line in real engagements as well as case interviews, as it will essentially point to the easiest and most straightforward way of doing things. Let’s say one of the questions in a case is asking you to come up with an approach to understand the appeal of a new beard trimmer. Obviously you can’t interview the whole male population so you might think about setting up a webpage and asking people to comment their thoughts. But what you would get would be a laundry list of difficult to sift through data.

Using an 80/20 approach you would segment the population based on critical factors (age groups, grooming habits etc.) and then approach a significant sample size of each (e.g. 20), analysing the data and reaching a conclusion.

5.4.3 The Pyramid Principle

This principle refers to organising your communication in a top-down , efficient manner. While this is generally applicable, the pyramid principle will most often be employed when delivering the final recommendation to your client. This means - as is implicit in the name - that you would organise your recommendation (and communication in general) as a pyramid, stating the conclusion or most important element at the top then go down the pyramid listing 3 supporting arguments and then further (ideally also 3) supporting arguments for those supporting arguments.

Let’s look at this in practice in a case interview context: your client is a German air-conditioning unit manufacturer who was looking to expand into the French market. However, after your analysis you’ve determined that the market share they were looking to capture would not be feasible. A final recommendation using the Pyramid Principle would sound something like this: ‘I recommend that we do not enter the German market for the following three reasons. Firstly, the market is too small for our ambitions of $50 million. Secondly the market is heavily concentrated, being controlled by three major players and our 5 year goal would amount to controlling 25% of the market, a share larger than that of any of the players. Thirdly, the alternative of going into the corporate market would not be feasible, as it has high barriers to entry.Then, if needed, we could delve deeper into each of our categories

6. Case examples or building blocks?

As we mentioned before, in your case interview preparation you will undoubtedly find preparation resources that claim that there are several standard types of cases and that there is a general framework that can be applied to each type of case. While there are indeed cases that are straightforward at least in appearance and seemingly invite the application of such frameworks, the reality is never that simple and cases often involve multiple or more complicated components that cannot be fitted into a simple framework.

At MCC we don’t want you to get into the habit of trying to identify which case type you’re dealing with and pull out a framework, but we do recognize that there are recurring elements in frameworks that are useful - such as the profitability of a venture (with its revenues and costs), the valuation of a business, estimating and segmenting a market and pricing a product.

We call these building blocks because they can be used to build case frameworks but are not a framework in and of themselves, and they can be shuffled around and rearranged in any way necessary to be tailored to our case. Hence, our approach is not to make you think in terms of case types but work from first principles and use these building blocks to build your own framework. Let’s take two case prompts to illustrate our point.

The first is from the Bain website, where the candidate is asked whether they think it’s a good idea for their friend to open a coffee shop in Cambridge UK (see the case here ). The answer framework provided here is a very straightforward profitability analysis framework, examining the potential revenues and potential costs of the venture:

While this is a good point to start for your case interview (especially taken together with the clarifying questions), we will notice that this approach will need more tailoring to the case - for example the quantity of coffee will be determined by the market for coffee drinkers in Cambridge, which we have to determine based on preference. We are in England so a lot of people will be drinking tea but we are in a university town so perhaps more people than average are drinking coffee as it provides a better boost when studying. All these are some much needed case-tailored hypotheses that we can make based on the initial approach.

Just by looking at this case we might be tempted to say that we can just take a profitability case and apply it without any issues. However, this generic framework is just a starting point and in reality we would need to tailor it much further in the way we had started to do in order to get to a satisfactory answer. For example, the framework for this specific case interview doesn’t cover aspects such as the customer’s expertise: does the friend have any knowledge of the coffee business, such as where to source coffee and how to prepare it? Also, we could argue there may be some legal factors to consider here, such as any approvals that they might need from the city council to run a coffee shop on site, or some specific trade licences that are not really covered in the basic profitability framework.

Let’s take a different case , however, from the McKinsey website. In this scenario, the candidate is being asked to identify some factors in order to choose where to focus the client’s conservation efforts. Immediately we can realise that this case doesn’t lend itself to any pre-packaged framework and we will need to come up with something from scratch - and take a look at McKinsey’s answer of the areas to focus on:

We notice immediately that this framework is 100% tailored to the case - of course there are elements which we encounter in other cases, such as costs and risks but again these are applied in an organic way. It’s pretty clear that while no standard framework would work in this case, the aforementioned concepts - costs and risks - and the way to approach them (a.k.a building blocks ) are fundamentally similar throughout cases (with the obvious specificities of each case).

In what follows, we’ll give a brief description of each building block starting from the Bain example discussed previously, in order to give you a general idea of what they are and their adaptability, but you should make sure to follow the link to the in-depth articles to learn all their ins and outs.

6.1 Estimates and segmentation

This building block will come into play mostly when you’re thinking about the market for a certain product (but make sure to read the full article for more details). Let’s take our Bain Cambridge coffee example. As we mentioned under the quantity bucket we need to understand what the market size for coffee in Cambridge would be - so we can make an estimation based on segmentation .

The key to a good estimation is the ability to logically break down the problem into more manageable pieces. This will generally mean segmenting a wider population to find a particular target group. We can start off with the population of Cambridge - which we estimate at 100.000. In reality the population is closer to 150.000 but that doesn’t matter - the estimation has to be reasonable and not accurate , so unless the interviewer gives you a reason to reconsider you can follow your instinct. We can divide that into people who do and don’t drink coffee. Given our arguments before, we can conclude that 80% of those, so 80.000 drink coffee. Then we can further segment into those who drink regularly - let’s say every day - and those who drink occasionally - let’s say once a week. Based on the assumptions before about the student population needing coffee to function, and with Cambridge having a high student population, we can assume that 80% of those drinking coffee are regular drinkers, so that would be 64.000 regular drinkers and 16.000 occasional drinkers. We can then decide whom we want to target what our strategy needs to be:

This type of estimation and segmentation can be applied to any case specifics - hence why it is a building block.

6.2 Profitability

We had several looks at this building block so far (see an in-depth look here ) as it will show up in most case interivew scenarios, since profit is a key element in any company’s strategy. As we have seen, the starting point to this analysis is to consider both the costs and revenues of a company, and try to determine whether revenues need to be improved or whether costs need to be lowered. In the coffee example, the revenues are dictated by the average price per coffe x the number of coffees sold , whereas costs can be split into fixed and variable .

Some examples of fixed costs would be the rent for the stores and the cost of the personnel and utilities, while the most obvious variable costs would be the coffee beans used and the takeaway containers (when needed). We may further split revenues in this case into Main revenues - i.e. the sales of coffee - and Ancillary revenues , which can be divided into Sales of food products (sales of pastries, sandwiches etc., each with the same price x quantity schema) and Revenues from events - i.e renting out the coffee shop to events and catering for the events themselves. Bear in mind that revenues will be heavily influenced by the penetration rate , i.e. the share of the market which we can capture.

6.3 Pricing

Helping a company determine how much they should charge for their goods or services is another theme that comes up frequently in cases. While it may seem less complicated than the other building blocks, we assure you it’s not - you will have to understand and consider several factors, such as the costs a company is incurring, their general strategic positioning, availability, market trends as well as the customers’ willingness to pay (or WTP in short) - so make sure to check out our in-depth guide here .

In our example, we may determine that the cost per cup (coffee beans, staff, rent) is £1. We want to be student friendly so we should consider how much students would want to pay for a coffee as well as how much are competitors are charging. Based on those factors, it would be reasonable to charge on average £2 per cup of coffee. It’s true that our competitors are charging £3 but they are targeting mostly the adult market, whose willingness to pay is higher, so their pricing model takes that into account as well as the lower volume of customers in that demographic.

6.4. Valuation

A variant of the pricing building block, a valuation problem generally asks the candidate to determine how much a client should pay for a specific company (the target of an acquisition) as well as what other factors to consider. The two most important factors (but not the only ones - for a comprehensive review see our Valuation article ) to consider are the net present value (in consulting interviews usually in perpetuity) and the synergies .

In short, the net present value of a company is how much profit it currently brings in, divided by how much that cash flow will depreciate in the future and can be represented with the equation below:

The synergies refer to what could be achieved should the companies operate as one, and can be divided into cost and revenue synergies .

Let’s expand our coffee example a bit to understand these. Imagine that our friend manages to open a chain of coffee shops in Cambridge and in the future considers acquiring a chain of take-out restaurants. The most straightforward example of revenue synergies would be cross-selling, in this case selling coffee in the restaurants as well as in the dedicated stores, and thus getting an immediate boost in market share by using the existing customers of the restaurant chain. A cost synergy would be merging the delivery services of the two businesses to deliver both food and coffee, thus avoiding redundancies and reducing costs associated with twice the number of drivers and vehicles.

6.5. Competitive interaction

This component of cases deals with situations where the market in which a company is operating changes and the company must decide what to do. These changes often have to do with a new player entering the market (again for more details make sure to dive into the Competitive Interaction article ).

Let’s assume that our Cambridge coffee shop has now become a chain and has flagged up to other competitors that Cambridge is a blooming market for coffee. As such, Starbucks has decided to open a few stores in Cambridge themselves, to test this market. The question which might be posed to a candidate is what should our coffee chain do. One way (and a MECE one) to approach the problem is to decide between doing something and doing nothing . We might consider merging with another coffee chain and pooling our resources or playing to our strengths and repositioning ourselves as ‘your student-friendly, shop around the corner’. Just as easily we may just wait the situation out and see whether indeed Starbucks is cutting into our market share - after all, the advantages of our product and services might speak for themselves and Starbucks might end up tanking. Both of these are viable options if argued right and depending on the further specifics of the case.

6.6. Special cases

Most cases deal with private sectors, where the overarching objective entails profit in some form. However, as hinted before, there are cases which deal with other sectors where there are other KPIs in place . The former will usually contain one or several of these building blocks whereas the latter will very likely have neither. This latter category is arguably the one that will stretch your analytical and organisational skills to the limit, since there will be very little familiarity that you can fall back on (McKinsey famously employs such cases in their interview process).

So how do we tackle the structure for such cases? The short answer would be starting from first principles and using the problem driven structure outlined above, but let’s look at a quick example in the form of a McKinsey case :

The first question addressed to the candidate is the following:

This is in fact asking us to build a structure for the case. So what should we have in mind here? Most importantly, we should start with a structure that is MECE and we should remember to do that by considering all the stakeholders . They are on the one hand the government and affiliated institutions and on the other the population. We might then consider which issues might arise for each shareholder and what the benefits for them would be, as well as the risks. This approach is illustrated in the answer McKinsey provides as well:

More than anything, this type of case shows us how important it is to practise and build different types of structures, and think about MECE ways of segmenting the problem.

7. How Do I prepare for case interviews

In consulting fashion, the overall preparation can be structured into theoretical preparation and practical preparation , with each category then being subdivided into individual prep and prep with a partner .

As a general rule, the level and intensity of the preparation will differ based on your background - naturally if you have a business background (and have been part of a consulting club or something similar) your preparation will be less intensive than if you’re starting from scratch. The way we suggest you go about it is to start with theoretical preparation , which means learning about case interviews, business and basic consulting concepts (you can do this using free resources - such as the ones we provide - or if you want a more through preparation you can consider joining our Case Academy as well).

You can then move on to the practical preparation which should start with doing solo cases and focusing on areas of improvement, and then move on to preparation with a partner , which should be another candidate or - ideally - an ex-consultant.

Let’s go into more details with respect to each type of preparation.

7.1. Solo practice

The two most important areas of focus in sole preparation are:

• Mental math

As we mentioned briefly, the best use of your time is to focus on solving cases. You can start with cases listed on MBB sites since they are clearly stated and have worked solutions as well (e.g. Bain is a good place to start) and then move to more complex cases (our Case Library also offers a range of cases of different complexities). To build your confidence, start out on easier case questions, work through with the solutions, and don't worry about time. As you get better, you can move on to more difficult cases and try to get through them more quickly. You should practice around eight case studies on your own to build your confidence.

Another important area of practice is your mental mathematics as this skill will considerably increase your confidence and is neglected by many applicants - much to their immediate regret in the case interview. Find our mental math tool here or in our course, and practice at least ten minutes per day, from day one until the day before the interview.

7.2. Preparation with a partner

There are aspects of a case interview - such as asking clarifying questions - which you cannot do alone and this is why, after you feel comfortable, you should move on to practice with another person. There are two options here:

• Practicing with a peer
• Practicing with an ex-consultant

In theory they can be complementary - especially if you’re peer is also preparing for consulting interviews - and each have advantages and disadvantages. A peer is likely to practice with you for free for longer, however you may end up reinforcing some bad habits or unable to get actionable feedback. A consultant will be able to provide you the latter but having their help for the same number of hours as a peer will come at a higher cost. Let’s look at each option in more detail.

7.2.1. Peer preparation

Once you have worked through eight cases solo, you should be ready to simulate the case interview more closely and start working with another person.

Here, many candidates turn to peer practice - that is, doing mock case interviews with friends, classmates or others also applying to consulting. If you’re in university, and especially in business school, there will very likely be a consulting club for you to join and do lots of case practice with. If you don’t have anyone to practice, though, or if you just want to get a bit more volume in with others, our free meeting board lets you find fellow applicants from around the world with whom to practice. We recommend practicing around 10 to 15 ‘live’ cases to really get to a point where you feel comfortable.

7.2.2. Preparation with a consultant

You can do a lot practising by yourself and with peers. However, nothing will bring up your skills so quickly and profoundly as working with a real consultant.

Perhaps think about it like boxing. You can practice drills and work on punch bags all you want, but at some point you need to get into the ring and do some actual sparring if you ever want to be ready to fight.

Practicing with an ex consultant is essentialy a simulation of a case interview. Of course, it isn’t possible to secure the time of experienced top-tier consultants for free. However, when considering whether you should invest to boost your chances of success, it is worth considering the difference in your salary over even just a few years between getting into a top-tier firm versus a second-tier one. In the light of thousands in increased annual earnings (easily accumulating into millions over multiple years), it becomes clear that getting expert interview help really is one of the best investments you can make in your own future.

Should you decide to make this step, MyConsultingCoach can help, offering bespoke mentoring programmes , where you are paired with a 5+ year experienced, ex-MBB mentor of your choosing, who will then oversee your whole case interview preparation from start to finish - giving you your best possible chance of landing a job!

7.3. Practice for online interviews

Standard preparation for interview case studies will carry directly over to online cases.

However, if you want to do some more specific prep, you can work through cases solo to a timer and using a calculator and/or Excel (online cases generally allow calculators and second computers to help you, whilst these are banned in live case interviews).

Older PST-style questions also make great prep, but a particularly good simulation is the self-assessment tests included in our Case Academy course . These multiple choice business questions conducted with a strict time limit are great preparation for the current crop of online cases.

7.4. Fit interviews

As we’ve noted, even something billed as a case interview is very likely to contain a fit interview as a subset.

We have an article on fit interviews and also include a full set of lessons on how to answer fit questions properly as a subset of our comprehensive Case Academy course .

Here though, the important thing to convey is that you take preparing for fit questions every bit as seriously as you do case prep.

Since they sound the same as you might encounter when interviewing for other industries, the temptation is to regard these as “just normal interview questions”.

However, consulting firms take your answers to these questions a good deal more seriously than elsewhere.

This isn’t just for fluffy “corporate culture” reasons. The long hours and close teamwork, as well as the client-facing nature of management consulting, mean that your personality and ability to get on with others is going to be a big part of making you a tolerable and effective co-worker.

If you know you’ll have to spend 14+ hour working days with someone you hire and that your annual bonus depends on them not alienating clients, you better believe you’ll pay attention to their character in interview.

There are also hard-nosed financial reasons for the likes of McKinsey, Bain and BCG to drill down so hard on your answers.

In particular, top consultancies have huge issues with staff retention. The average management consultant only stays with these firms for around two years before they have moved on to a new industry.

In some cases, consultants bail out because they can’t keep up with the arduous consulting lifestyle of long hours and endless travel. In many instances, though, departing consultants are lured away by exit opportunities - such as the well trodden paths towards internal strategy roles, private equity or becoming a start-up founder.

Indeed, many individuals will intentionally use a two year stint in consulting as something like an MBA they are getting paid for - giving them accelerated exposure to the business world and letting them pivot into something new.

Consulting firms want to get a decent return on investment for training new recruits. Thus, they want hires who not only intend to stick with consulting longer-term, but also have a temperament that makes this feasible and an overall career trajectory where it just makes sense for them to stay put.

This should hammer home the point that, if you want to get an offer, you need to be fully prepared to answer fit questions - and to do so excellently - any time you have a case interview.

8. Interview day - what to expect, with tips

Of course, all this theory is well and good, but a lot of readers might be concerned about what exactly to expect in real life . It’s perfectly reasonable to want to get as clear a picture as possible here - we all want to know what we are going up against when we face a new challenge!

Indeed, it is important to think about your interview in more holistic terms, rather than just focusing on small aspects of analysis. Getting everything exactly correct is less important than the overall approach you take to reasoning and how you communicate - and candidates often lose sight of this fact.

In this section, then, we’ll run through the case interview experience from start to finish, directing you to resources with more details where appropriate. As a supplement to this, the following video from Bain is excellent. It portrays an abridged version of a case interview, but is very useful as a guide to what to expect - not just from Bain, but from McKinsey, BCG and any other high-level consulting firm.

8.1. Getting started

Though you might be shown through to the office by a staff member, usually your interviewer will come and collect you from a waiting area. Either way, when you first encounter them, you should greet your interviewer with a warm smile and a handshake (unless they do not offer their hand). Be confident without verging into arrogance. You will be asked to take a seat in the interviewer’s office, where the case interview can then begin.

8.1.1. First impressions

In reality, your assessment begins before you even sit down at your interviewer’s desk. Whether at a conscious level or not, the impression you make within the first few seconds of meeting your interviewer is likely to significantly inform the final hiring decision (again, whether consciously or not).

Your presentation and how you hold yourself and behave are all important . If this seems strange, consider that, if hired, you will be personally responsible for many clients’ impressions of the firm. These things are part of the job! Much of material on the fit interview is useful here, whilst we also cover first impressions and presentation generally in our article on what to wear to interview .

As we have noted above, your interview might start with a fit segment - that is, with the interviewer asking questions about your experiences, your soft skills, and motivation to want to join consulting generally and that firm in particular. In short, the kinds of things a case study can’t tell them about you. We have a fit interview article and course to get you up to speed here.

8.1.2. Down to business

Following an initial conversation, your interviewer will introduce your case study , providing a prompt for the question you have to answer. You will have a pen and paper in front of you and should (neatly) note down the salient pieces of information (keep this up throughout the interview).

It is crucial here that you don’t delve into analysis or calculations straight away . Case prompts can be tricky and easy to misunderstand, especially when you are under pressure. Rather, ask any questions you need to fully understand the case question and then validate that understanding with the interviewer before you kick off any analysis. Better to eliminate mistakes now than experience that sinking feeling of realising you have gotten the whole thing wrong halfway through your case!

This process is covered in our article on identifying the problem and in greater detail in our Case Academy lesson on that subject.

8.1.3. Analysis

Once you understand the problem, you should take a few seconds to set your thoughts in order and draw up an initial structure for how you want to proceed. You might benefit from utilising one or more of our building blocks here to make a strong start. Present this to your interviewer and get their approval before you get into the nuts and bolts of analysis.

We cover the mechanics of how to structure your problem and lead the analysis in our articles here and here and more thoroughly in the MCC Case Academy . What it is important to convey here, though, is that your case interview is supposed to be a conversation rather than a written exam . Your interviewer takes a role closer to a co-worker than an invigilator and you should be conversing with them throughout.

Indeed, how you communicate with your interviewer and explain your rationale is a crucial element of how you will be assessed. Case questions in general, are not posed to see if you can produce the correct answer, but rather to see how you think . Your interviewer wants to see you approach the case in a structured, rational fashion. The only way they are going to know your thought processes, though, is if you tell them!

To demonstrate this point, here is another excellent video from Bain, where candidates are compared.

Note that multiple different answers to each question are considered acceptable and that Bain is primarily concerned with the thought processes of the candidate’s exhibit .

Another reason why communication is absolutely essential to case interview success is the simple reason that you will not have all the facts you need to complete your analysis at the outset. Rather, you will usually have to ask the interviewer for additional data throughout the case to allow you to proceed .

NB: Don't be let down by your math!

Your ability to quickly and accurately interpret these charts and other figures under pressure is one of the skills that is being assessed. You will also need to make any calculations with the same speed and accuracy (without a calculator!). As such, be sure that you are up to speed on your consulting math .

8.1.4. Recommendation

Finally, you will be asked to present a recommendation. This should be delivered in a brief, top-down "elevator pitch" format , as if you are speaking to a time-pressured CEO. Again here, how you communicate will be just as important as the details of what you say, and you should aim to speak clearly and with confidence.

For more detail on how to give the perfect recommendation, take a look at our articles on the Pyramid Principle and providing recommendations , as well the relevant lesson within MCC Academy .

8.1.5. Wrapping up

After your case is complete, there might be a few more fit questions - including a chance for you to ask some questions of the interviewer . This is your opportunity to make a good parting impression.

We deal with the details in our fit interview resources. However, it is always worth bearing in mind just how many candidates your interviewers are going to see giving similar answers to the same questions in the same office. A pretty obvious pre-requisite to being considered for a job is that your interviewer remembers you in the first place. Whilst you shouldn't do something stupid just to be noticed, asking interesting parting questions is a good way to be remembered.

Now, with the interview wrapped up, it’s time to shake hands, thank the interviewer for their time and leave the room .

You might have other case interviews or tests that day or you might be heading home. Either way, if know that you did all you could to prepare, you can leave content in the knowledge that you have the best possible chance of receiving an email with a job offer. This is our mission at MCC - to provide all the resources you need to realise your full potential and land your dream consulting job!

8.2. Remote and one-way interview tips

Zoom case interviews and “one-way” automated fit interviews are becoming more common as selection processes are increasingly remote, with these new formats being accompanied by their own unique challenges.

Obviously you won’t have to worry about lobbies and shaking hands for a video interview. However, a lot remains the same. You still need to do the same prep in terms of getting good at case cracking and expressing your fit answers. The specific considerations around remote case interviews are, in effect, around making sure you come across as effectively as you would in person.

8.2.1. Connection

It sounds trivial, but a successful video case interview of any kind presupposes a functioning computer with a stable and sufficient internet connection.

Absolutely don’t forget to have your laptop plugged in, as your battery will definitely let you down mid-interview. Similarly, make sure any housemates or family know not to use the microwave, vacuum cleaner or anything else that makes wifi cut out (or makes a lot of noise, obviously)

If you have to connect on a platform you don’t use much (for example, if it’s on Teams and you’re used to Zoom), make sure you have the up to date version of the app in advance, rather than having to wait for an obligatory download and end up late to join. Whilst you’re at it, make sure you’re familiar with the controls etc. At the risk of being made fun of, don’t be afraid to have a practice call with a friend.

8.2.2. Dress

You might get guidance on a slightly more relaxed dress code for a Zoom interview. However, if in doubt, dress as you would for the real thing (see our article here ).

Either way, always remember that presentation is part of what you are being assessed on - the firm needs to know you can be presentable for clients. Taking this stuff seriously also shows respect for your interviewer and their time in interviewing you.

8.2.3. Lighting

An aspect of presentation that you have to devote some thought to for a Zoom case interview is your lighting.

Hopefully, you long ago nailed a lighting set-up during the Covid lockdowns. However, make sure to check your lighting in advance with your webcam - bearing in mind what time if day your case interview actually is. If your case interview is late afternoon, don’t just check in the morning. Make sure you aren’t going to be blinded from light coming in a window behind your screen, or that you end up with the weird shadow stripes from blinds all over your face.

Natural light is always best, but if there won’t be much of that during your interview, you’ll likely want to experiment with moving some lamps around.

8.2.4. Clarity

The actual stories you tell in an automated “one-way” fit interview will be the same as for a live equivalent. If anything, things should be easier, as you can rattle off a practised monologue without an interviewer interrupting you to ask for clarifications.

You can probably also assume that the algorithm assessing your performance is sufficiently capable that it will be observing you at much the same level as a human interviewer. However, it is probably still worth speaking as clearly as possible with these kinds of interviews and paying extra attention to your lighting to ensure that your face is clearly visible.

No doubt the AIs scoring these interviews are improving all the time, but you still want to make their job as easy as possible. Just think about the same things as you would with a live Zoom case interview, but more so.

9. How we can help

There are lots of great free resources on this site to get you started with preparation, from all our articles on case solving and consulting skills to our free case library and peer practice meeting board .

To step your preparation up a notch, though, our Case Academy course will give you everything you need to know to solve the most complex of cases - whether those are in live case interviews, with chatbots, written tests or any other format.

Whatever kind of case you end up facing, nothing will bring up your skillset faster than the kind of acute, actionable feedback you can get from a mock case interview a real, MBB consultant. Whilst it's possible to get by without this kind of coaching, it does tend to be the biggest single difference maker for successful candidates.

You can find out more on our coaching page:

Explore Coaching

Of course, for those looking for a truly comprehensive programme, with a 5+ year experienced MBB consultant overseeing their entire prep personally, from networking and applications right through to your offer, we have our mentoring programmes.

You can read more here:

Comprehensive Mentoring

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• The 1%: Conquer Your Consulting Case Interview
• Consulting Career Secrets
• Cover Letter & Resume
• McKinsey Solve Game (Imbellus)
• BCG Online Case (+ Pymetrics, Spark Hire)
• Bain Aptitude Tests (SOVA, Pymetrics, HireVue)
• Kearney Recruitment Test
• BCG Cognitive Test Practice

All-in-One Case Interview Preparation

• Industry Cheat Sheets
• Structuring & Brainstorming
• Data & Chart Interpretation
• Case Math Mastery
• McKinsey Interview Academy

Brainteasers

Master consulting case interviews: the insider guide.

Last Updated on March 26, 2024

Embarking on a career with prestigious consulting firms like McKinsey , BCG , Bain or any other top consulting firm is a highly sought-after achievement for many aspiring consultants. However, one of the biggest challenges in this journey is excelling in the consulting case interview – a critical component of the hiring process for these elite firms. Known for their rigorous selection process , top-tier consulting firms evaluate candidates not only through Personal Fit Interviews but also through case interviews, making them among the hardest companies to secure a position with.

I am dedicated to guiding candidates through the nuances of preparing for consulting case interviews since I have observed a plethora of misinformation online regarding case interviews – much of it incorrect, outdated, or misleadingly generalized across all consulting firms. This misinformation, often propagated by self-proclaimed ‘experts’ who lack real-world experience with MBB , can hinder your chances of success in securing a role with these prestigious companies.

In response, I made it my mission to demystify the case interview process, offering insights and strategies rooted in authentic, first-hand experience. My goal is to equip you with the knowledge and skills necessary to navigate the consulting recruitment journey confidently and successfully with top-tier firms.

In this article, I want to help you understand the intricacies of the case interview as a first step of your consulting case interview prep by answering the following questions:

• What is a consulting case interview?
• What skills are assessed, and how are you scored?
• What is the role of the interviewer, and what is on their mind?
• What is the format of the case interview?
• What are the elements in a typical case interview you need to ace?
• What are the differences in case interviews across firms?
• How should you prepare for a case interview?

This article is part of our consulting case interview series. It is your first step in mastering case interviews for top consulting firms, providing you with a foundational understanding. Our guide offers an insider’s perspective on the MBB case strategies, ensuring you’re well-prepared for interviews at McKinsey, BCG, and Bain. For the other articles, please click below:

• Overview of case interviews: what is a consulting case interview? (this article)
• How to create case interview frameworks
• How to ace case interview exhibit and chart interpretation
• How to ace case interview math questions
• How to approach brainstorming in a case interview

For a fully fleshed-out discussion of case interviews and consulting interview preparation, please check out my book The 1%: Conquer Your Consulting Case Interview on Amazon.

Introduction to Consulting Case Interviews

This section of our consulting firms interview guide delves into what a consulting case interview entails, setting the stage for a deeper understanding of the selection process.

The case interview is employed by all top-tier consulting firms to test the analytical capabilities and communication skills of applicants. It simulates a client situation, where you are tasked to solve a specific (business) problem (e.g., “ Why are our revenues decreasing?” ) or implement a client request or answer a client question (e.g., “We want to become more customer friendly” ).

You need to figure out how your client can achieve a certain goal or solve a problem by influencing the right levers.

Sample case interview prompts

Typical cases might start in the following way:

“Over the last year, our client, a Caribbean tour operator has seen a significant decrease in bookings. The CEO wants us to find out what happened and increase the bookings again back to baseline levels from three years ago.”

Here, the goal is to increase bookings back to baseline levels.

“Our client, a leading guitar brand, has asked us whether or not they should open up a new factory in Indonesia for a new line of entry-level guitars.”

Here, the goal is to provide a recommendation about opening a new guitar factory.

“We are working with the government of a small developing country to create a strategy that would spread education to children between the ages of six to 14 in remote villages. We need to devise a ramp-up plan for the next 24 months to make this a reality.”

Here, the goal is to come up with a plan for educating children in remote villages.

Case interview tasks

As you can see, these situations and problems and the associated goals are varied and diverse, and usually taken from a real-life client engagement of your interviewer. Yet, while every case brief is unique, you would follow the same logic and approach when solving the case. You always need to figure out what levers you should move and how to reach a desired outcome. To solve a case successfully, there are a couple of tasks that are interdependent and partially iterative in nature. You need to:

• understand a client request and operationalize the goal(s)
• create an analytical framework to investigate the situation
• use hypotheses to elicit more qualitative and quantitative information from your interviewer by going through your framework, asking targeted questions
• analyze, interpret, and contextualize the information collected through the discussions, charts, graphs, and data tables, as well as quantitative problems
• synthesize your findings and relate them to the initial case brief
• identify the root cause(s) of the problem, and find the most suitable approach and the right levers to pull
• provide recommendation(s) to satisfy your client’s request.

The interview is a (usually) 20-30 minute dialogue between you and the interviewer, where you need to structure your approach, propose concrete ideas and analyses, gather information, spot insights on data tables and charts, solve quantitative tasks, and provide recommendations, all while communicating in a professional, structured, and calm way. The other part of the interview slot is usually spent on the fit interview.

The case interview is difficult since it involves several different skills that you need to demonstrate, not just in one part of a case but consistently across all parts within one case and across multiple interviews in succession. Candidates usually go through three to six case interviews before receiving an offer. Consistency is key as you need to convince all interviewers by solving their respective cases.

Not an easy feat!

Let’s have a look at the different skills at play and how they are evaluated. The skills assessed during management consulting interviews are critical for determining a candidate’s ability to thrive in the fast-paced world of consulting.

Skills Assessed in a Case Interview

While during the screening stage, consulting firms check your resume to establish that you might have the potential to be a good candidate, during the interviews, they want to put that potential to the test to see if you can develop into a world-class consultant.

Once hired, you are put in front of the client, where you represent the prestigious legacy of your firm from day one. Hence, the skillset you need to display in a case interview is the same as that required in the daily life of a management consultant. The case interviews are essentially a trial run to gauge how well you would be able to solve problems and communicate later on.

Before you start your preparation, it is important to understand what aspects the interviewer scores your performance on. Knowing what interviewers look for, you can tailor your approach, interpret feedback, and work toward mastery of each area.

Below are the seven key dimensions you need to focus on that the interviewer evaluates, including examples of how you can display mastery in each. In later parts and links to other articles, I show you how these skills translate to real case examples, and how you can employ and hone them most effectively.

Problem-solving

• Do you understand what the overarching problem and client request is about?
• Can you identify and operationalize the goal(s) of the client?
• Can you deconstruct the problem or situation into its parts, structuring a MECE (mutually exclusive, collectively exhaustive) issue tree (framework), covering all aspects without overlaps?
• Do you understand the most important components/drivers/levers in this situation?

Application in a case interview: To provide a recommendation at the end of the case interview, you need to work on one or multiple problems or tasks for the fictitious client. Great candidates clarify the situation, operationalize the goal(s) of the client, and then set up their analysis by splitting the problem into multiple components, the most common tool to achieve that being the issue tree .

A good problem deconstruction is the anchor that keeps you focused and on track while moving through the case and investigating the situation. Once you have received the question you are trying to solve during the case, you need to create your issue tree with each branch of the tree representing a part of the problem or situation you would like to investigate. These parts are drivers or levers you can influence to change the outcome for your client. Your approach should be MECE, meaning that it should cover all aspects of the problem or situation without overlaps.

• Do you think about a situation holistically, offering broad, deep, and insightful perspectives, adding new ways of thinking on top of more common-sense ideas?
• Are you able to look at the situation from different perspectives?
• Can you draft a range of concrete ideas and rich descriptions that qualify why your mentioned areas are important to investigate?
• Are you able to come up with creative ideas, solutions, and recommendations?

Application in a case interview: One way to rise to the top of a bunch of case interview candidates is to demonstrate a spike in creativity. When thinking about the situation and your issue tree, go as broad and as deep as possible. Try to come up with creative angles/top-level ideas to the problem that cover it exhaustively (the breadth), and draft rich descriptions with concrete ideas that support each top level (the depth). Refrain from using memorized frameworks like 90% of other applicants.

Remember: Creativity is nothing without structure. Keep your creative thoughts contained in a MECE structure as described above. Additionally, once you have identified the root cause of the problem or the gist of the situation or are simply asked to brainstorm ideas and solutions, come up with creative insights on top of more common ideas you might have.

For instance, remembering our guitar manufacturer and their new factory example from above, a standard insight would be to consider the cost of the venture. Creative insights would be to consider the impact of a new low-cost line of guitars on brand reputation and the effect of cannibalization on the existing product lineup.

• Can you link the structure with creative thinking to create meaningful and logical analyses on a deep enough level based on sound arguments?
• Are you using a hypothesis-driven approach to your problem-solving, i.e., have a clear picture of where you think the case solution can be found most likely, hence, tackling high-impact issues first by asking the right questions and always being aware of where to go next, potentially changing course if needed?
• Can you swiftly interpret and synthesize data, charts, exhibits, and statements made by the interviewer in the context of your hypotheses?
• Do you see interdependencies in different parts of the problem, your analyses, and proposed solutions, and understand how the key drivers/levers of the problem or situation interact with each other?

Application in a case interview: Analytical rigor links structure and creative thinking, guiding you as you move through your issue tree to investigate the situation. Employ a hypothesis-driven approach to your problem-solving, i.e., have a clear picture of where you think the solution of the case is buried. This way, you can qualify and justify why certain areas are important to investigate, tackle likely high-impact issues first, lead the interviewer, and ask the right questions to elicit relevant information quickly.

After going through a branch of your issue tree, synthesize your findings and discuss how they relate to your status quo in the case, then move to the next branch if needed until you find the key pieces of information that help you solve the case. Move vertically, then horizontally. When receiving new information such as data from exhibits, interpret it with your hypotheses in mind. You should never boil the ocean, i.e., try to analyze everything there is, but follow a concrete and logical course of action and analysis, focusing on areas where you believe the most impact lies ( 80/20 ).

Demonstrate that you can move the case forward on your own by synthesizing and discussing the next potential analyses or implementation measures for your ideas. Show that you are adaptable when new information pops up that might make you change course. Keep in mind how the different parts of the situation interact with and relate to each other. Employing these habits significantly increases your chances of figuring out the root cause(s) of the problem or understanding the key drivers of the situation quickly, which helps you to devise a sound recommendation, even if you do not have the perfect information.

Quantitative reasoning

• Do you understand how a certain number/outcome of a calculation could help you move forward, and can you interpret quantitative outcomes in the context of the case?
• Are you able to structure quantitative problems, drafting the correct approach to calculate the desired outcome variable(s)?
• Are you able to comfortably perform calculations and manipulate large numbers, relying on simple pen-and-paper math and mental math?
• Can you move swiftly and accurately through math questions, spotting traps, and using shortcuts or are you prone to making repeated smaller or larger mistakes?

Application in a case interview: There are four steps that expert case solvers ace when cracking math problems. First, they understand what specific quantitative analysis could help their understanding of the problem or enable them to provide a recommendation and how. Second, they set up the correct analysis and approach to calculate a desired outcome variable. It’s necessary to think about the information required to answer the question, set up the right equations, and ask for more data if needed, all while paying attention to potential traps or shortcuts. Even simple computations often include a twist. Third, they swiftly and accurately perform calculations, relying on pen-and-paper math. Calculations usually revolve around simple arithmetic. Fourth, strong candidates present their answers to the interviewer, interpret them in the context of the case, and then move on from there.

Communication

• Do you communicate in a concise, effective, structured, and top-down manner?
• Are you using logical and coherent sentences, professional language, and business vocabulary?
• Do your statements add value to your analysis, or do you ramble?
• Are you leading the conversation or merely getting dragged along by the interviewer?

Application in a case interview: Strong candidates communicate like consultants, which is essential for three reasons. First, you need to guide the interviewer through your issue tree and thinking, second, elicit the right information, and third, convince the interviewer about your ideas and recommendations. For all three, you need to communicate top-down, starting with the key point, and then providing supporting arguments for it. You want to ensure that your statements are to the point, and coherent and demonstrate a good command of business language. Time is limited so avoid endless rambling about topics or going in circles, repeating what you have already said.

Ensure you share your thoughts and considerations with the interviewer. They need to understand how you reach a certain conclusion or insight. For instance, when discussing your drafted analysis, tell the interviewer what you would like to investigate as well as why you think that’s a good idea.

Lastly, lead the conversation. Remember to be in the driver’s seat all the time.

Maturity and presence

• Are you confident and present in the room/on the video call and demonstrate case leadership?
• Are you comfortable with silence while taking time to think and asking clarification questions or asking for guidance?
• Do you come across as friendly and professional with a pleasant countenance and gesticulation?
• Are you professionally dressed and does your appearance match the setting?

Application in a case interview: Consulting firms are looking for mature leaders. Interviewers want to see that they can put you in front of senior clients, where you represent the legacy of the firm and the credibility of your team. They want to make sure that you are self-standing, cool under pressure, engaged, and confident in difficult discussions and situations as well as act and dress professionally . In addition, interviewers want to hire candidates who are genuinely engaging, nice, and pleasant to be around since they might soon spend 16 hours a day with you in the same (small) team room for several weeks in a row.

Business sense and intuition

• Can you get up to speed with a new industry, client, and situation quickly?
• Are you asking the right questions that help you understand and move forward?
• Can you make sense of new information quickly and interpret it properly in the current context?
• Can you provide suitable, actionable, sensible, and relevant recommendations for the situation at hand?

Application in a case interview: Business sense is sort of an enabler for Analytics (discussed above). While you are certainly not expected to know details about a certain industry or a specific context of the case, you need to be able to demonstrate business sense and intuition, which is mostly just common sense. You should be able to quickly understand a new situation – even just by asking targeted questions about how a specific business works, what the main cost drivers are, how the business makes money, etc. When receiving new information or insights during the case, you need to be able to make sense of it in the context of the business and relate it to the information you already have as well as the situation at hand.

Interviewers would like to see you quickly gravitate toward and identify the root cause of a problem or the key drivers/levers of a situation (see Analytics , above), which is easier if you are quick to navigate uncharted territories. Use your common sense, experience, and knowledge of other industries or contexts to explain certain phenomena in the case, for instance, when working with assumptions or interpretations. Business sense and intuition also drive the quality of your proposed recommendations.

Learn the essential tips for successful case interviews, a crucial component for candidates looking to make their mark with our dedicated resource below. We explore real-life examples of management consulting interviews to illustrate the diversity and depth of case studies you might encounter.

Unlock your path to consulting success with the ultimate case interview preparation package. Tailored for aspiring consultants, this package offers 79 targeted theory lessons and hundreds of practice drills across key areas: Structuring, Chart Interpretation, Math, and Brainstorming. Developed to meet the rigorous MBB standards, it distills over 5 years of McKinsey insights and strategies from more than 1600+ case interviews into actionable, battle-tested advice. Perfect for students, recent graduates, or professionals aiming to ace their case interviews.

Case Interview Scoring and Evaluation

Understanding the consulting interview process, including how firms score your performance, can significantly improve your preparation strategy.

Grading of skills

All consulting firms score case interviews in a similar manner, even though their scale and terminology might differ slightly. After every interview, interviewers fill out a feedback sheet, covering the aspects discussed in the previous section in one way or another. For each section, they rank your performance across a five-point scale:

1 – Insufficient: Candidate does not display a basic command of the desired skill

2 – Adequate: Candidate displays an average command of the desired skill

3 – Good: Candidate displays a solid command of the desired skill

4 – Very Good: Candidate displays a strong command of the desired skill

5 – Distinctive: Candidate displays mastery of the desired skill.

Creating the perfect profile

Interviewers add a written commentary on their overall impression, highlighting positive, negative, as well as neutral observations. Two things are crucial for you to get the offer. First, you need to steer clear of the first two categories. Insufficient and adequate ratings usually lead to direct rejection. At a minimum, you need to display a good performance for every skill within an interview as well as across interviews.

Second, you need to demonstrate clear performance spikes, i.e., several very good and distinctive ratings across all interviews; the more the better to make the cut and get the offer. The latter provides the interviewer with arguments and reasons to make a hiring recommendation about your performance to fellow interviewers and the firm. You can find a link to the feedback sheet in by clicking on it below to use during peer case practice.

Now, for the interviewer, the overall picture counts. Mistakes in one area need to be balanced by a strong performance in other areas.  All consulting firms want to see spikes in performance in certain areas and good enough performance in other areas. That is why in our discussion on McKinsey, Bain, and BCG case interview preparation, we emphasize the importance of a holistic approach, from problem-solving to communication skills.

The  most common example  I see often: You can be strong in structure and exhibit, yet make a small mistake in the math section – overall as you might consider 80% – and still pass on to the next round.

The Role of Professional Interviewers

Case interviews are by their very nature a highly structured process. The interviewer takes the role of a fictitious client or your project manager with the goal to jointly moving through and solving a (business) case. A crucial aspect of how to ace case interviews lies in anticipating the interviewer’s perspective and aligning your responses accordingly

Striving for objectivity

Firms try to ensure that the format of the case and the evaluation metrics are standardized across cases and interviewers. Even though each case is different, the types of questions, the case flow, the evaluation metrics, and the difficulty level should be the same to allow for a fair evaluation and comparison of all candidates. Yet, that is not always the case and when interviewing with different firms, you will encounter varying interview types and styles depending either on the company, the individual interviewer, or the particular office, as well as different levels of professionalism and structure. The more professional a consulting firm is, the less variance there is in the individual interviewers’ or offices’ style, and the more structured and objective the whole experience is.

You should get detailed information about the process and format of the interviews and logistics well ahead of time. Additionally, you might receive access to training resources beforehand, and sometimes even take part in a case interview coaching call or a virtual coaching session together with other candidates.

On the interview day, you receive your interviewers’ profiles. Each has prepared a standardized and tested case in line with the firm’s interviewing guidelines. With this calibrated case, they can grade your performance objectively as described above. Of course, personality and personal liking still play a role, but due to the objectivity and structured interview approach that top firms employ, each candidate has the same chance.

Variance in interviews

In smaller firms, you do not get as much advance information or access to training resources. Additionally, interviewers usually have more leeway in how they conduct the interview and rate your performance. Such firms spend much less on recruiting, and the whole process is simply not as standardized. For instance, I did an interview at a boutique firm, where I had to design and solve my own case at the same time. While interesting and challenging, the process was more chaotic, and every candidate had to solve a different non-calibrated case, making it much harder to evaluate and compare objectively. It might be more difficult to prepare for unstructured case experiences, but firms that employ such formats generally have lower performance expectations.

Find out early how interviews are conducted at your target firm to practice the right way and to tailor your approach accordingly. When you know exactly what to expect and what is expected of you, absent of surprises, the experience feels more natural and you can use your full mental resources to crack the case.

Dealing with bad interviewers

A word of caution: Be aware of the odd unprepared or irritated interviewers that appear from time to time, for instance, because they had to fill in for a colleague at the last minute. They might be in a bad mood, they don’t have a lot of time, they are distracted since a client call blew up in their face five minutes ago, etc. Such interviewers are not only unprofessional but a danger to your success, especially if they come up with a case on the spot, which could lead to mutual confusion and an unpleasant experience. I regularly receive horror stories about poor interviewer performances across all firms from my clients. For instance, I have a client whose interview was conducted while the consultant was in a taxi, with the connection constantly cutting out. Another had an interview with a senior partner who muted himself to take work calls during the interview and was highly irritated when talking to the candidate.

If you encounter an unprofessional interviewer or go through an unfortunate experience, contact HR and tell them about it. State politely why the experience made it impossible to perform at your best. In those two recent cases, after they got in touch with HR, both got another chance, and the performance of their unpleasant interview was not considered; both ended up with the desired offer. It pays off to push back on bad recruiting experiences and share your frustrations with HR.

Different Case Interview Formats

Before dealing with consulting applications, most candidates have never heard about case interviews. In this part, I’ll dive deeper into the format and answer the following questions:

• What are the different types and variations of case interviews?
• What are the differences between a candidate-led and interviewer-led case interview?
• What are the differences between the first and final round of case interviews (separate article)?

We can classify case interviews based on these three criteria: the type of case, the driver of the case, and the interview round.

First, the type of case. Most top-tier firms employ typical business case interviews, some employ market sizing cases; and very few still employ brainteasers. Second, we can differentiate between candidate-led cases and interviewer-led cases. For most firms, case interviews are conducted in a candidate-led format, meaning that you must move through the case autonomously, shaping the direction of your analysis moving from insight to insight to eventually arrive at a conclusion. Most notably, McKinsey employs an interviewer-led format, in which the interviewer takes the lead and guides you through the case, asking a series of questions. Third, case interviews differ based on the status and progress of your application. Most candidates expect more difficult cases in their final round. More often than not, this is not true as all interviews focus on the same skills and use the same evaluation metrics.

Types of Case Interviews

Consultancies employ three different types of case questions to screen applicants.

A brainteaser is the umbrella term for odd, usually quite short, questions that test your analytical capabilities. Your goal is to grasp, structure, and creatively solve them. Do not act surprised if the interviewer asks you questions such as “Why are manhole covers round?” – you should come up with a structured answer, listing several potential explanations or, “How many tennis balls can you fit in a Boeing 747?” – you should come up with a strong analytical answer, demonstrating that you are able to break down the problem into multiple parts and coherently analyze it.

For every brainteaser, come up with a logical approach, and reasonable assumptions, and perform quick calculations if needed. Top-tier firms rarely employ these types of questions since they are quite detached from actual business problems and do not allow for objective evaluation metrics and comparison of candidates.

You can learn more about brainteasers here (they are very rare but belong into the preparation plan of a well-prepared applicant)..

Market sizing and estimation questions

One of the most frequent tasks of consultants on a project is to calculate the size of a market or estimate potentials (e.g., the revenue of a new product, and the cost of a new production facility). That’s why these types of questions are often used in case interviews. Such questions can be part of a longer business case or asked standalone. Typical questions sound like: “What is the size of the dairy market in China, in USD revenue per year?” or “How many diapers can we sell in Germany each year?” Sometimes interviewers ask more abstract estimation questions such as, “How many doors are in the city of Los Angeles?”, which is essentially a brainteaser.

The key is to create an equation with the main drivers of the number you are trying to estimate. Ask for data or – if not available – come up with estimates on the spot, basing them on reasonable assumptions. Finally, plug in the numbers and perform your calculation; then, interpret the outcome. The process and speed are more important than the correctness of your answer, which should be in the right ballpark. It is appreciated when you take shortcuts and use simple numbers. Avoid the semblance of being precise over being pragmatic. Adding more variables does not make the outcome more accurate but takes more time and increases the risk of mistakes in your approach and calculation.

I cover market sizing in more detail in this article .

Business cases (McKinsey: Problem Solving Interview)

Business cases are the most common and the most difficult questions you can encounter in a case interview. Most top-tier firms solely employ business cases in their selection process. You are asked to solve a typical business problem of a fictitious client. To do this properly, you split the problem into its components and identify levers you can work on, ask the right questions to work your way through the case, analyze the facts given to you, and eventually draw proper conclusions. Typical business cases – the same as actual consulting engagements – are usually placed in an industry and functional matrix. Industry refers to the type of business, i.e., what product or service the client is selling, and function refers to the area of the business, i.e., what part of the business you are dealing with.

The typical industries you might encounter in a case interview are: Aerospace, Agriculture, Automotive, Chemicals, Consumer Goods, Defense, Education, Electronics, Energy (Oil, Gas, Power), Financial Services, Healthcare, Industrial, Infrastructure, Logistics, Materials, Media, Metals and Mining, Paper and Packaging, Pharmaceuticals, Private Equity and Principal Investors, Public and Social Sector, Real Estate, Retail, Semiconductors, Technology, Telecommunication, Transportation, Travel and Tourism. For an overview and deep dive into 27 industries, including business models, financials, challenges, and trends, check out our industry cheat sheets .

The typical functions you might have to deal with in a case interview are: Corporate Finance, Digital, Implementation, Manufacturing, Marketing and Sales, Mergers and Acquisitions, Operations, People and Organizational Performance, Recovery and Transformation, Risk and Resilience, Strategy, Sustainability.

Every period has its focal topics. For instance, while digitization has been a hot topic for consulting firms over the last 10 years, sustainability and the pandemic response are the key focal points at the moment. Expect to receive more cases related to these topics.

Based on the industry and the function, case questions might revolve around the following topics (not exhaustive): Business model evaluation, Changes in the market, Competitive or situational response, Growth strategies (organic or inorganic via mergers and acquisitions), Market entry, Operational optimization, Pricing strategies, Product introduction, Profitability (i.e., growing revenue and reducing cost), Strategic positioning, Restructuring, and more creative cases (see the initial framework example about the machine breakdowns later in the article about frameworks and issue trees ). Firms are moving away from framework-based, standard business cases to more creative problems that demand candidates think on their feet.

The remainder of this article focuses on actual business cases since they make up the majority (more than ninety-five percent with the rest being mostly market sizing) of case interviews in top-tier firms.

Candidate-led vs. interviewer-led case interviews

When preparing for case interviews with MBB firms you need insights into adapting your strategy to meet the unique challenges of each firm’s interview style.

When it comes down to who is driving the case, there are two types of interviews, interviewer-led and candidate-led ones. Most firms employ candidate-led case interviews, with the notable exception of McKinsey, which follows an interviewer-led approach. Some firms such as Oliver Wyman or Strategy& sometimes employ elements of both interview formats, while (very!) rarely McKinsey final round interviews might also contain elements of a candidate-led interview.

Both types have certain things in common:

• The elements of the case are the same. You must structure problems, generate hypotheses, interpret exhibits, work through some calculations, come up with a recommendation, etc.
• The skills that are assessed are the same. You need to exhibit strong problem-solving skills, creativity, analytics, good communication, etc.

However, there is one key difference.

In the candidate-led case, you drive the case yourself. It is your responsibility to move down the right path of analyses and elicit the correct information by asking effective questions related to the right items of your issue tree to end up with enough insights to provide a recommendation.

In interviewer-led cases, you take ownership of every question and go into greater detail, while the interviewer guides you from question to question. If you answer each individual question well, McKinsey interviewers often do not ask for a recommendation at all.

Candidate-led cases

Due to the nature of your role as an autonomous investigator, it is much easier to get lost, walk down the wrong branch of the issue tree, or waste a ton of time. The initial framework is your analytical lens and tool to identify the key levers that are essential to answer the client’s question or solve the client’s problem. Maybe you won’t even figure out the situation at all since the relevant problem areas were never part of your initial issue tree in the first place. That is why you should formulate a clear hypothesis about the key drivers of the problem before developing the actual framework and then diving deeper.

While interviewers try to influence you to move in the right direction (pay attention to their hints!), it is still up to you what elements of the problem you would like to analyze and how. Each answer should lead to a new question, driven by your hypotheses, on your quest to find the root cause of the problem or to understand the situation and the levers you can pull to come up with a recommendation. The upsides are that you have more control over the case and its direction and do not need to create the exhaustive frameworks necessary for a McKinsey case. Your top-level buckets for a candidate-led and interviewer-led case would be the same, yet for a candidate-led case, you discuss areas on a deeper level only if they promise to validate your thinking and hypotheses.

Interviewer-led cases (McKinsey-style)

The interviewer guides you through a series of three to seven connected questions (structure, exhibit, brainstorming, and math, sometimes a recommendation – there can be 2 math questions for instance) that you need to answer, synthesize, and develop recommendations from. The initial framework is your map that should consider all elements of the situation, touching on everything that is relevant, yet not necessarily critical for the solution. You should still answer each question with a hypothesis-driven mindset to demonstrate your spike in this area. However, for McKinsey, it is more of a demonstration exercise as there is rarely a single correct answer or single correct hypothesis. Irrespective of your hypothesis, interviewers move the case forward through a series of separate and often unrelated questions.

These types of cases are arguably easier to prepare for and to go through since the risk of getting lost along the way is low. If you struggle with one question, you can start from scratch with the next question. Your initial issue tree cannot derail the outcome of your case entirely. The downsides are that you need to draft a more exhaustive framework with equally deep and balanced ideas, and you have less control over the direction of the case.

While in a candidate-led case, the main goal is to reach a sound recommendation after going through your issue tree, asking the right questions, analyzing the right data, etc., your task in an interviewer-led case is to provide sound and self-standing answers to each individual question. Think of the latter as a series of mini cases, where you tackle each question specifically. I believe interviewer-led cases are easier to solve as you only need to worry about one problem at a time (while still remembering the context of the case). As a result, it is also much less about the correct result or solution (except for the numerical part), but much more about your approach, exhaustiveness, and creativity of ideas. It is almost impossible to go off on a tangent and not reach an outcome, whereas in a candidate-led case, you always run the risk of investigating completely irrelevant parts of the issue tree, losing time, and coming up with a faulty conclusion or none at all.

While you should practice a common set of skills (structuring and idea generation, math, exhibit interpretation, hypothesis generation, and communication), you need to follow a different game plan for each interview format. Knowing what steps to take and when to take them makes it easier for you to focus on problem-solving, creativity, and analytics throughout. I prepare clients for both formats and how they study and how they approach cases makes a significant difference in their performance. A one-size-fits-all approach does not work, especially when we are talking about the level of competitiveness and the low offer rates in top-tier firms. You want to be well-prepared for each type of case and use the different formats to your advantage.

In fact, case interviews are very formulaic in nature and there is a certain checklist of habits – what to do and when – you should employ to go through in order to maximize your outcomes. This checklist is different between the types of cases. In the later chapters, we go through each building block of a case and then discuss the different game plans for both types of cases for you to internalize and follow going forward.

With your game plans internalized, practice each case format individually and make it clear at the beginning of a practice session with a case buddy what format the case should be. When working with peers, I would recommend that you switch to an interviewer role from time to time as this gives you new insights into similarities and differences between both approaches.

Ace the case interview with our dedicated preparation packages.

Format and Length of a Typical Consulting Case Interview

A typical consulting interview consists of a personal fit part, usually around 20 to 30 minutes long, and the case interview, which lasts between 20 to 30 minutes (depending on the firm, office, and interview stage). For BCG and Bain , the interviews are conducted in a candidate-led format , meaning that you have to move through the case autonomously, shaping the direction of your analysis and moving from insight to insight. McKinsey employs an interviewer-led format , meaning that the interviewer takes the lead and guides you through the case, asking a succession of three to seven questions.

Check out our article on the specifics of the McKinsey case interview format .

Another specific format is the consulting written case interview, which is employed by BCG and Bain during second-round interviews. Read more about the BCG written case interview and the Bain written case interview .

Now that you know how the interview is conducted and what skills you need to display, let’s look at the typical elements in a case interview.

Elements of a Typical Case Interview

In a typical consulting case study interview you will have to answer  five different elements  – broadly speaking:

Structuring

• Exhibit Interpretation

Brainstorming

Recommendation.

Through real case interview examples, we will explore the essential components you need to master, from structuring your analysis to crafting compelling recommendations.

A consulting case interview structure is used to break the problem you are trying to solve for the client down into smaller problems or components. It is the roadmap you establish at the beginning of the interview that will guide your problem-solving approach throughout the case.

It involves organizing your approach to the client’s problem in a way that is both systematic and logical. The structure helps ensure that you cover all relevant aspects of the problem without overlooking critical areas. It also enables you to communicate your thought process clearly and effectively to the interviewer. Typically, a good structure will be MECE (Mutually Exclusive, Collectively Exhaustive), ensuring that your analysis covers all bases without overlap.

A well-structured approach generally includes the following steps:

• Clarification of the problem: Understand and define the core issue. Confirm your understanding with the interviewer to ensure you’re on the right track.
• Establishing objectives: Identify what the client aims to achieve, including any specific goals or constraints.
• Developing the framework: Break down the main problem into smaller, manageable components.
• Analyzing components: Dive deeper into each component of your framework. Use data, logic, and business concepts to analyze each part.
• Formulating hypotheses and prioritizing: Based on your analysis, develop hypotheses about potential areas of concern that you would like to analyze first.

Example: Profitability

Problem statement: A client has experienced a significant drop in profitability over the last year. They have hired you to identify the underlying causes and recommend solutions.

1. Clarification of the problem

• Confirm the problem: The primary issue is the decline in profitability, not revenue or costs in isolation.

2. Establishing objectives

• The objective is to restore profitability to previous levels or better, within a reasonable timeframe, considering any constraints like budget or market conditions.

3. Developing the framework

• Use the profitability approach, breaking down profitability into revenues and costs. Further break down revenues by volume and price, and costs into fixed and variable.

4. Analyzing components

• Revenues: Analyze trends in sales volume and prices.
• Costs: Examine both fixed and variable costs.

5. Formulating hypotheses

• Prioritize one area you want to investigate first and understand quantitatively what has changed (either revenue or cost or both). This will allow you to understand where to focus, and then continue your analysis to get to the why (reasons for it) and work on a recommendation.

By using such a structured approach, you systematically tackle the problem, ensuring thorough analysis and clear communication of your findings and recommendations.

Read more about how to build case interview structures and frameworks here .

Chart and data interpretation

For chart or data interpretation , you are tasked to find the key insights of 1-2 PowerPoint slides and relate them to the case question and the client situation at hand.

Incorporating chart or data interpretation into a consulting case interview involves analyzing visual data representations to extract insights, trends, and patterns that are relevant to the client’s problem. This process not only demonstrates your ability to work with data but also your capability to connect these insights to the broader strategic questions facing the client.

When presented with charts or graphs, your task is to quickly identify what they signify, how they relate to the case at hand, and what implications they might have for your recommendations.

Here’s how to approach chart or data interpretation within the context of a structured case interview:

• Briefly examine the chart: Start by quickly reviewing the chart to understand what types of data are presented. Note the axes labels, units of measurement, and any legends or keys.
• Summarize key findings: Identify the most critical pieces of information or trends shown in the chart. Look for changes over time, differences among groups, or outliers that may indicate areas of interest or concern.
• Analyze in context: Relate your observations from the chart back to the overall case problem and the client’s situation. Consider how the data impacts the problem areas you’ve identified or alters the hypotheses you are exploring. Use the data to refine your hypotheses or to generate new insights. Data might reveal unexpected trends or challenge assumptions, leading you to reconsider parts of your analysis.
• Discuss next steps: Consider what actions might be recommended or what additional data might be needed to make informed decisions.

Example: Market expansion

Problem statement: A retail clothing company is considering expanding into a new market and has hired you to determine the potential for profitability in this venture.

Data presentation: You are shown a chart that displays the annual revenue growth rates for the retail clothing industry in several regions over the past five years.

1. Briefly examine the chart

• Notice that the chart compares growth rates across North America, Europe, Asia, and South America, with each year marked clearly.

2. Summarize key findings

• Asia shows a consistent upward trend in growth rate, Europe is relatively stable, while North America and South America show slight volatility with a general downward trend.

3. Analyze in context

• Considering the client’s objective to expand for profitability, the chart suggests that Asia might offer the most promising opportunity due to its growth trend. However, the stability in Europe could signify a safe, albeit less dynamic, market. The growth in Asia could indicate increasing consumer spending in the retail sector, potentially due to rising middle-class income. However, entering a high-growth market may also involve higher competition and operating costs.

4. Discuss next steps

• Based on the data, you might recommend conducting a deeper market analysis in select Asian countries to assess competition, consumer preferences, and potential barriers to entry. Simultaneously, a risk assessment for Europe could determine if it serves as a stable alternative with lower entry barriers.

This approach shows how chart interpretation, when integrated into a structured case analysis, helps in deriving actionable insights that are directly tied to the client’s strategic objectives.

Read more about how to interpret case exhibits, charts, and data tables here .

Case math questions have you analyze a problem mathematically before qualitatively investigating the particular reason for the numerical result or deriving specific recommendations from the outcome.

Case math questions involve applying quantitative analysis to solve or understand aspects of the client’s problem. This step is critical because it grounds your hypotheses and recommendations in empirical evidence, making your conclusions more convincing. When tackling case math questions, it’s essential to clearly articulate your calculations, explain your reasoning, and interpret the results in the context of the case.

Here’s a structured approach to a case math question:

• Understand the question: Clarify any assumptions and confirm the variables involved in the calculation. Ensure you fully understand what you’re being asked to calculate.
• Plan your approach: Before diving into calculations, outline how you intend to approach the problem. This could involve breaking down the calculation into smaller, more manageable parts or identifying formulas that will be necessary. Discuss this with the interviewer.
• Execute calculations: Perform the calculations methodically, keeping track of your steps. This not only helps in ensuring accuracy but also allows you to easily backtrack if you need to correct or adjust your approach.
• Interpret results: Once you have your numerical result, take a step back to interpret what it means in the context of the case. Consider how it affects your understanding of the problem and what implications it might have for your recommendations.

Example: Break-even analysis

Problem statement: A company is planning to launch a new product and wants to know how many units it needs to sell to break even.

Data provided (simplified):

• Fixed costs for the launch: $500,000
• Variable costs per unit: $50
• Selling price per unit: $150

1. Understand the question

• You need to calculate the break-even quantity, where total costs equal total revenue.

2. Plan your approach

• Use the break-even formula: Break-Even Quantity = Fixed Costs / (Selling Price per Unit – Variable Cost per Unit).

3. Execute calculations

Break-Even Quantity = $500,000 / ($150−$50) = $500,000 / $100 = 5,000 units

4. Interpret results

• The company must sell 5,000 units of the new product to break even. This figure serves as a critical benchmark for assessing the feasibility of the new product launch. It reflects not just the cost recovery point but also the scale of operations needed to achieve profitability.
• Given the break-even analysis, recommend whether the company should proceed with the product launch. Consider factors such as market demand, the company’s capacity to produce and sell 5,000 units, and the timeline for reaching this sales volume. If proceeding, suggest marketing strategies and operational adjustments to ensure the sales target is met.

Incorporating case math into your analysis not only demonstrates your quantitative skills but also enhances the credibility of your strategic recommendations by backing them up with concrete figures.

Read more on how to approach and ace case math here .

Brainstorming questions test your creativity and have you come up with a structured list of different ideas and initiatives.

Brainstorming questions further test your ability to think creatively and strategically under pressure. These questions are designed to explore your capacity to generate a wide range of ideas, assess their potential impact, and structure them coherently and logically. The key to successfully navigating brainstorming questions is not just to produce a list of ideas but to organize them meaningfully, showing your thought process and how each idea could be relevant to the client’s objectives.

Here’s how you might approach a brainstorming question within a structured case interview:

• Understand the objective: Clarify the goal of the brainstorming. Are you generating ideas for growth, solving a problem, or perhaps identifying risks? Understanding the objective shapes the direction of your brainstorming.
• Set parameters: Before generating ideas, define any constraints or criteria that the solutions should meet. This might include budget limitations, brand alignment, or feasibility considerations.
• Generate ideas: Start producing ideas, aiming for quantity over quality initially. Use creative thinking techniques like thinking from different perspectives, leveraging analogies from other industries, or applying trends.
• Organize ideas: Once you have a list of ideas, organize them into categories. This could be based on the nature of the ideas (e.g., technology-driven, customer experience improvements, operational efficiencies), potential impact (short-term vs. long-term), or resource requirements (low investment vs. high investment).
• Evaluate and select: Briefly evaluate the ideas based on their feasibility, potential impact, and alignment with the client’s objectives. Highlight a few top ideas that seem most promising for further exploration.
• Recommend further steps: Suggest how the top ideas could be further evaluated or implemented, including potential pilot tests, market research, or financial modeling to assess viability.

Example: Brainstorming

Problem statement: A beverage company is looking to expand its market presence and seeks innovative ideas to achieve this goal.

1. Understand the objective

• The objective is to identify strategies for market expansion.

2. Set parameters

• Solutions should be feasible within a 1-2 year timeframe and align with the company’s sustainable and health-conscious brand image.

3. Generate ideas

• Product innovation: Develop new health-oriented beverages.
• Market penetration: Increase presence in existing markets through targeted marketing campaigns.
• Market development: Enter new geographical markets, focusing on untapped urban areas.
• Diversification: Explore adjacent product categories, such as healthy snacks.
• Partnerships: Collaborate with gyms and wellness centers to promote products.

4. Organize ideas

• Product-based strategies: Product innovation and diversification.
• Market-based strategies: Market penetration and development.
• Partnership and collaboration: Working with gyms and wellness centers.

5. Evaluate and select

• Given the brand’s focus, product innovation, and partnerships with gyms could provide both immediate and long-term growth opportunities, aligning with the brand image and tapping into current consumer health trends.

6. Recommend further steps

• Suggest conducting market research to identify consumer preferences for new health-oriented beverages. Recommend a pilot program for partnership with gyms in select markets to gauge consumer response and potential for brand synergy.

In this way, brainstorming questions not only assess your ability to think creatively but also your ability to prioritize ideas and propose practical next steps for exploration and implementation.

For more on brainstorming in case interviews, read this detailed article.

The recommendation is usually a brief synthesis of your analysis, starting with one or several clear recommendations, followed by supporting arguments from your analysis and the next steps.

This recommendation should encapsulate the essence of your creative thought process, underpinned by analytical rigor. Begin with a clear, decisive statement of what you believe the client should do, directly addressing the case question. Follow this with a succinct summary of the key reasons supporting your recommendation, drawing from the insights and analysis throughout the case. Emphasize how your suggested actions align with the client’s goals and constraints identified at the outset.

Lastly, outline a few critical next steps that the client could take to initiate the recommended actions. These might include conducting a feasibility study, developing a pilot project, or initiating market research to validate assumptions. By providing a roadmap for implementation, you demonstrate not only strategic foresight but also practicality in bringing your creative solutions to fruition. This approach ensures that your recommendation is not only insightful but also actionable, providing a clear path forward for the client.

Moving through the case

The trick in candidate-led interviews is to move through the initial case framework or structure, investigating each area by asking the interviewer targeted questions based on your hypotheses. You will receive additional information as well as data in the form of charts that you need to interpret or math questions that you need to solve. As the case progresses, your hypotheses should become clearer and each piece of additional information should add to a converging line of evidence. Once you have gathered enough data in each part of your structure and the case, you should be able to provide one or more definite recommendations

Now for  structure and exhibit interpretation . Focus on answers that are

• hypothesis-driven
• follow a strong communication (MECE, top-down, signposted)

That being said, there is no 100% that you can reach or a one-and-only solution/ answer. Your answers must display the characteristics specified above and are supported well with arguments. This approach should allow you to move through the case, reaching relevant insights quickly.

As for  math questions , usually, some answers are correct (not always 100% the same since some candidates simplify or round differently – which is ok), and others are wrong, either due to the

• calculation approach
• calculation itself

How to Prepare for Consulting Case Interviews

Effective case interview practice is crucial for success; this part outlines a structured approach to prepare for management consulting interviews.

The right mindset

Many candidates approach consulting case preparation with the assumption that memorizing generic frameworks or seeking out management consulting case studies with ready-made solutions will give them an edge. They hope to find a one-size-fits-all approach in the form of a PDF filled with case study questions and answers, believing that cases are uniform across different firms, interviewers, and interview scenarios. Unfortunately, this belief in a magical shortcut or a consulting case interview “cheat sheet” is misplaced.

Relying solely on memorized, case-specific frameworks with the expectation that they will apply universally across all scenarios you encounter is a flawed strategy. Unlike the more formulaic approaches that might be suggested in some MBB case study guides or books, mastering a flexible approach to problem-solving is far more critical. This adaptability is even more crucial for MBB interviews than for those with tier-2 consultancies or boutique firms.

The focus should be on understanding the underlying principles behind each type of question you may face in a case interview, and the skills needed to address them effectively, irrespective of the case’s specifics such as the client, industry, or function involved.

The reliance on prep books filled with case interview frameworks, reminiscent of the early 2000s and the era of figures like Victor Cheng or the “Case in Point” methodology, is outdated. All firms have evolved, designing their case interviews to assess a candidate’s creativity and on-the-spot insight generation rather than their ability to recall specific frameworks.

Attempting to apply a rigid framework to a case that demands a different approach can be detrimental. It not only fails but also instills a false confidence that quickly turns into stress when the realization hits that the approach is ineffective in a live interview setting. This is a common pitfall I’ve observed many times.

Instead, your aim should be to master the art of constructing issue trees, analyzing charts, and performing calculations across any context, industry, or function presented in the case. My advice is to step away from memorizing frameworks and focus on these skills, guided by MBB case interview tips. Consider working with a tutor specialized in consulting case interviews to fast-track your learning and enhance your interview performance.

If you want to read more about this, continue here .

For a list of up-to-date case interview examples from many top consulting firms, click here .

A proper preparation plan

A thorough preparation plan for consulting case interviews is crucial for developing your analytical prowess, problem-solving skills, and the ability to think on your feet – qualities revered by top consulting firms like McKinsey, BCG, and Bain. The key to a successful preparation strategy lies in identifying and leveraging your strengths while concurrently addressing your weaknesses. This dual-focused approach ensures you present yourself as a well-rounded candidate (remember the scoring sheet from above?).

Start by understanding how to approach the different elements of the case, by working on targeted drills, and by practicing case studies that span various industries and problems, allowing you to apply your strengths in real-world scenarios while identifying areas for improvement. Engage in mock interviews with peers or mentors who can provide constructive feedback, focusing on enhancing your analytical thinking, communication skills, and overall case presentation.

Simultaneously, developing a personalized practice plan that targets your specific weaknesses is essential. Whether it’s improving your mental math, becoming more structured in your problem-solving approach, or enhancing your ability to derive insights from complex data, dedicating time to these areas can significantly elevate your performance. Utilize resources like case books, online courses, and interactive case interview simulations to diversify your preparation methods. Additionally, incorporating feedback from mock interviews into your practice routine can help refine your approach and strategy.

For further guidance on crafting a comprehensive practice plan that balances strengths and weaknesses, refer to our detailed article Creating the Perfect Practice Plan for Consulting Case Interviews. This resource offers step-by-step advice and advanced strategies to build the ideal profile for securing your spot at a top consulting firm.

Effective case interview practice techniques are vital, forming the backbone of a candidate’s journey to consulting success.

Differences in candidate-led vs. interviewer-led practice

We are coming from the interviewer-led McKinsey-style cases and can tell you that it makes a difference for the candidates how they study and how they approach cases.

A one-size-fits-all approach does not work, especially when we are talking about the level of competitiveness and the low offer rate in MBB. You want to be well-prepared for each type of case and  use the different logistics at play to your advantage.

That being said, the same principles of problem-solving prowess apply to both types of interviews. However, interviewer-led cases are very formulaic in nature and there is a certain checklist of habits (what do and when) you should employ to go through to maximize your performance (more on that below). And this checklist is quite different from an interviewee-led case.

While in an interviewee-led case, the main goal is to reach a sound recommendation after going through your issue, analyzing data, etc., the main goal in a McKinsey case is to provide sound and self-standing answers to each question (structure, math, exhibit). Think of the latter as a series of mini-cases. More often than not, there will not even be a synthesis/summary in the end (unless your structuring part is weak).

Hence, you should tackle each individual question in a specific way. When you know what actions you should take for each type of question, it is easier for you to focus, be creative, and be structured throughout each question. We think they are much easier to solve as you have to worry only about one problem at a time.

As a result, in a McKinsey case, it is also much less about the correct result or solution (except for the numerical part), but much more about how you approach, how you solve, and how you communicate. It is very difficult to actually go off a tangent and not reach an outcome in the end, whereas in an interviewee-led you always run the risk of investigating some completely irrelevant parts of the issue tree, losing time, then coming up with a faulty conclusion.

For these reasons, I believe that you should prepare a set of common skills (structuring, math, exhibit interpretation, communication), that are relevant for both types of cases, however, study and internalize a different game plan and approach for each type of interview.

Then, practice, practice, practice each type of case individually and make it clear at the beginning of each session what the case should be like.

Also, I can recommend you switch to the interviewer role in some cases. This will give you new and interesting insights into the differences between both approaches.

How We Help You Ace All Case Interviews

We have specialized in placing people from all walks of life with different backgrounds into top consulting firms both as generalist hires as well as specialized hires and experts. As former McKinsey consultants and interview experts, we help you by

• tailoring your resume and cover letter to meet consulting firms’ highest standards
• showing you how to pass the different online assessments and tests for McKinsey , BCG , and Bain
• showing you how to ace McKinsey interviews and the PEI with our video academy
• coaching you in our 1-on-1 sessions to become an excellent case solver and impress with your fit answers (90% success rate after 5 sessions)
• preparing your math to be bulletproof for every case interview
• helping you structure creative and complex case interviews
• teaching you how to interpret charts and exhibits like a consultant
• providing you with cheat sheets and overviews for 27 industries .

Reach out to us if you have any questions! Discover the best strategies for consulting case interviews, tailored to help you navigate the complexities of case studies across various consulting domains.

Frequently Asked Questions: Case Interviews

Preparing for a consulting case interview can be a challenging journey, filled with questions about the best ways to prepare, common pitfalls to avoid, and strategies to stand out to top firms like McKinsey, BCG, and Bain. To help you navigate this process, I’ve compiled a list of frequently asked questions that candidates often have but may not find directly addressed in typical preparation materials. Here’s a concise guide to some of your most pressing queries.

How long does it typically take to prepare adequately for a consulting case interview? Preparation time can vary widely depending on your starting point and schedule, but most successful candidates spend between 1 to 3 months preparing, dedicating several hours each week to practice cases, conduct drills, and refine problem-solving skills.

Can you provide examples of how to apply an analytical framework to a real-world consulting case scenario? Applying an analytical framework involves breaking down the case problem into key components. For example, in a profitability case, you might segment your analysis into revenue and cost components, then drill down into sub-components like pricing, volume, and variable costs.

What are some common mistakes candidates make during case interviews and how can they be avoided? Common mistakes include failing to listen carefully to the case prompt, neglecting to structure their thoughts coherently, and not synthesizing their findings effectively. Avoid these by practicing active listening, using MECE (Mutually Exclusive, Collectively Exhaustive) frameworks, and preparing a concise synthesis as you wrap up your case solution.

How do consulting firms adjust their case interviews for candidates with non-traditional backgrounds? Consulting firms look for problem-solving skills, analytical ability, and leadership potential over specific technical knowledge. Candidates from non-traditional backgrounds should focus on demonstrating these qualities, leveraging their unique experiences to provide fresh insights and perspectives on the cases.

What role does feedback play in the case interview preparation process, and how should candidates seek and utilize it? Feedback is crucial for improvement. Candidates should seek feedback after mock interviews with peers, mentors, or coaches, focusing on areas of weakness and strategies for improvement. Incorporate feedback into your practice sessions to gradually refine your approach and technique.

Are there differences in case interview formats or expectations among McKinsey, BCG, and Bain’s global offices? While the core skills assessed are consistent globally, besides the interviewer vs. candidate-led format slight variations in interview format and focus areas can occur across offices and practices due to market differences. Researching the specific office and practicing cases tailored to its region can be beneficial.

How can candidates demonstrate creativity in their approach to solving case interviews without straying too far from the structured analysis required? Demonstrate creativity by exploring unique solutions and considering non-traditional factors that could impact the case scenario, while still anchoring your analysis in a structured framework to maintain clarity and coherence in your approach.

What specific strategies can candidates use to improve their performance in the quantitative aspects of case interviews? Practice mental math daily, familiarize yourself with common business metrics and financial formulas, and learn shortcuts for frequent calculations. Structuring your quantitative analysis clearly before diving into the numbers can also help improve accuracy and speed.

In what ways do consulting firms evaluate a candidate’s business sense and intuition during a case interview? Firms assess business sense through your ability to quickly grasp the key issues at hand, make reasonable assumptions, and draw insights that are logical and applicable to the business context. Demonstrating an understanding of industry dynamics and the economic implications of your recommendations is key.

How can candidates balance thorough preparation with the need to remain flexible and adaptable in the case interview? While it’s important to prepare rigorously, being too rigid can hinder your performance. Develop a deep understanding of core skills and principles, but remain open to adjusting your approach based on the specific nuances of the case. Practice with a variety of cases to enhance your adaptability.

Struggling with case interviews?

Tackling cases can feel overwhelming, but remember, you’re not the only one facing this hurdle. If you find yourself puzzled by specific problems, don’t hesitate to share your questions below in the comment section. Your curiosity not only aids your understanding but also helps others who might be struggling with similar issues.

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Florian spent 5 years with McKinsey as a senior consultant. He is an experienced consulting interviewer and problem-solving coach, having interviewed 100s of candidates in real and mock interviews. He started StrategyCase.com to make top-tier consulting firms more accessible for top talent, using tailored and up-to-date know-how about their recruiting. He ranks as the most successful consulting case and fit interview coach, generating more than 500 offers with MBB, tier-2 firms, Big 4 consulting divisions, in-house consultancies, and boutique firms through direct coaching of his clients over the last 3.5 years. His books “The 1%: Conquer Your Consulting Case Interview” and “Consulting Career Secrets” are available via Amazon.

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Case Interview: The Free Preparation Guide (2024)

The case interview is a challenging interview format that simulates the job of a management consultant , testing candidates across a wide range of problem-solving dimensions.

McKinsey, BCG and Bain – along with other top consulting firms – use the case interview because it’s a statistically proven predictor of how well a candidate will perform in the role. The format is not only used by management consulting firms. Other types of organizations – like tech companies, financial services institutions, and non-profits – often use case interviews to assess candidates who are interviewing for roles focused on shaping strategic initiatives.

If you’re preparing to face a case interview, you may be feeling a little apprehensive. The format is notoriously demanding and unlike any other type of recruitment assessment you may have experienced before. However, with the right preparation and investment of time and effort, it is possible to master.

In this guide, we break down everything you need to know about the case interview, outlining exactly what you need to do to prepare effectively and ace the case.

Key takeaways

• The classic case interview format follows the same steps that a management consultant would encounter on a client project. The interview is a little like a role-play where the interviewer plays the role of a client and the candidate plays the part of the consultant hired to solve the problem.
• Some firms occasionally deviate from the classic case interview format. Popular alternatives include written case studies – which require candidates to review paper documents and then prepare and deliver a presentation – and market sizing case interviews, which require candidates to estimate a number.
• Case interviews test candidates against a set of six problem-solving dimensions: structuring, math, judgment and insights, creativity, synthesis, and case leadership. The interviewer uses a scorecard to assess the candidate’s performance in each of these areas.
• Case interview questions can be about almost any type of challenge or opportunity. However, our research indicates that there are 10 types of questions that are asked most frequently at top consulting firms. These include questions on profit improvement, revenue growth, and market entry.
• To do well in a case interview, it’s vital to create custom interview structures that meet the conditions of the ‘AIM’ test. It helps to have a good working knowledge of key case interview frameworks, but this alone is not sufficient.
• A strong grasp of case math is also crucial when it comes to case interview performance. While only high-school level math skills are required, it’s an aspect of the case interview that many candidates find challenging.
• Successful candidates are able to summarize their findings effectively. They also demonstrate strong case leadership by progressing through the case proactively and remaining focused on its overarching objectives.
• To prepare for a case interview, it’s essential to learn every problem-solving skill that will be assessed. We teach all of these skills in our Interview Prep Course , which contains all the video lectures, sample interviews, case material, and practice tools you’ll need to ace any case interview.
• Most candidates who go on to receive an offer from a top consulting firm like McKinsey, BCG or Bain complete at least 25 live practice sessions with a partner before their interview. You’ll find over 100 high-quality cases in our Case Library and a diverse community of candidates available for practice in our Practice Room .
• Some candidates choose to supplement their preparation by working with a coach who has been an interviewer at a top consulting firm. Here at CaseCoach, our coaches have all been handpicked from the alumni of top firms such as McKinsey, BCG and Bain.
• Although the world’s top consulting firms all test candidates using similar methods, none of them approach the interview process in exactly the same way. If you’re preparing to interview at a top consulting firm, it’s important to do your research and find out what you can expect.

An introduction to the case interview

The case interview format, the classic case interview.

The vast majority of case interviews follow the same steps that management consultants encounter on real client projects.

• Brief: The interviewer gives the candidate a brief for the case. They explain the context in which the client is operating, and outline the challenge they’re facing.
• Clarification: The candidate then has the chance to ask clarifying questions. They might do this to ensure they’ve understood the context of the problem correctly or to confirm the client’s goals.
• Reflection: The candidate takes 60 to 90 seconds or so to reflect and lay out a structured approach to solving the case.
• Analysis: The candidate and interviewer then work through the case together, carrying out analyses and moving toward a recommendation. This is the part of the case where you’ll be handling numerical questions, reviewing exhibits, coming up with creative ideas, and so on. It comprises the vast majority of the time you’ll spend on the case.
• Synthesis: The case concludes with the candidate synthesizing their findings and making an overall recommendation to the client.

So what does this unique interview format look and feel like? In reality, a consulting case interview is a little like a role-play. The interviewer plays the role of a manager or client, and the candidate plays the part of the consultant hired to solve the problem. However, a case interview shouldn’t feel like a performance. The most successful candidates treat it as a natural conversation between two professional people.

In the video below you can see an example of exceptional case interview performance in action. The candidate and interviewer in the video are both former McKinsey interviewers.

Interviewer-led vs candidate-led cases

Although the classic case interview has an established format and assesses a specific set of skills, cases can be delivered in different ways. Some are more candidate-led, while others are more interviewer-led

In a candidate-led case, the candidate is in the driver’s seat and is free to explore different aspects of the problem. Interviewers don’t tell candidates what to focus on next. Instead, they provide additional information – like an exhibit or a new fact – when asked. The candidate then analyzes the information and suggests next steps to get to the answer.

In an interviewer-led case, the interviewer may interrupt the candidate and ask them to either perform a specific investigation or focus on a different aspect of the problem. This doesn’t mean the interview is going badly; the interviewer is simply following a script. As a result, in an interviewer-led case, candidates are less likely to take the wrong path.

It’s difficult to predict which style of case you’ll receive. Some firms are known for using one style of interview more frequently than another. However, in practice, most interviews fall somewhere between the two extremes, depending on the style of the interviewer and the case material they’re using. You should therefore always be ready to suggest next steps and have a view about how to get to the answer.

Other case interview formats

While the classic case interview is most common, there are a couple of other interview formats that top consulting firms use from time to time:

The written case study

Some management consulting firms use written case studies to simulate the experience of carrying out consulting work even more accurately than the classic, verbal case interview. In some locations, BCG and Bain have been known to adopt this approach for a small minority of candidates.

In written cases, candidates review a series of paper documents and then structure the problem, run some numbers, generate ideas and, finally, deliver a short presentation. You can learn more in our article on how to crack written case studies .

Market sizing case interviews

Management consulting firms and other employers sometimes use market sizing questions – also known as estimation questions – as a standalone interview format to assess candidates on a wide range of problem-solving dimensions.

In a market sizing interview, you’ll be asked to estimate a number. This might be something like the revenue of a sandwich store or how many ATMs there are in a certain city. The ability to size a market is also a skill required for solving many case interview questions. You can learn more in our article on how to nail market sizing case interviews .

Some key differences to expect

While case interviews are highly codified, it’s important to remember that every interview is unique.

In the final round of interviews, for example, cases may feel less scripted than they did in the first stage. Partners – who are part of the interviewing group in the final round – often use the same case for years at a time. This means they can deliver it without a script and, as a result, tend to give candidates more room to take the lead. You can learn more in our article on the differences between a first and final-round interview at McKinsey, BCG and Bain .

In addition, each firm or office might bring their own nuance or style to the classic case interview format. It’s important to do your research and find out what you can expect from the interview experience at your target firm or office. You can learn more in our article on how the interviews at McKinsey, BCG and Bain differ .

The skills assessed in case interviews

Case interviews are primarily about testing a set of problem-solving skills. The interviewer uses a scorecard to assess a candidate’s performance in the following dimensions:

• Structuring: This is the ability to break problems down into logical drivers. It’s most obviously required at the beginning of a case, where you can pause and take a moment to come up with an approach. But it’s also tested each time you have to consider a new aspect of the problem.
• Math: Most cases contain a quantitative component, such as estimation questions, break-even questions, or other calculations. To do well in this dimension, you need to lay out a clear and efficient approach, run calculations quickly and accurately, and then state their implications for the case.
• Judgment and insights: This dimension is about extracting insights from data, usually by interpreting information in a chart. Performing well in this area involves processing new information quickly, prioritizing what’s important, and connecting your findings to develop sound recommendations.
• Creativity: Cases often have a creative thinking component. Sharing numerous, varied and sound ideas – ideally in a structured way – can help you succeed here.
• Synthesis: This is all about wrapping up the case with a clear and practical recommendation, and delivering it convincingly.
• Case leadership: This dimension is about progressing through the case efficiently and staying focused on its objectives. Case leadership involves gathering facts effectively and building on new findings to develop a recommendation. It’s a particularly important dimension in candidate-led cases.

Questions to expect

If you’re preparing to interview at a top management consulting firm like McKinsey, BCG or Bain, you’re probably curious about the kind of case interview questions you can expect to receive.

To identify the most common case interview questions , we surveyed CaseCoach users who interviewed at either McKinsey, BCG or Bain for a generalist role in 2023. We found that of the 260+ case interviews reported by respondents:

• 20% focused on profit improvement
• 15% focused on revenue growth
• 12% focused on market entry
• 10% focused on cost cutting
• 9% focused on process optimization

These topics align with the typical challenges and opportunities faced by CEOs. Because the job of a management consultant is to help CEOs find solutions to these problems, it’s vital for candidates to demonstrate that they understand the issues behind these questions.

However, while there are some recurring topics, the context and nuances of each individual case mean that no two case questions are the same. Increasingly, firms are testing candidates on questions that fall outside of these recurring topics. One way they’re doing this is by focusing on non-traditional areas, like the public sector. If you’re interviewing for a generalist management consulting role, it’s therefore important to be ready for almost any type of case question.

If you’re interviewing for a role that’s focused on a specific industry or function, like financial services , you’ll likely be given a case focused on that particular area.

How to ace the case

Case interviews require you to think on your feet to solve a complex problem that you’ve never seen before, while being assessed against a number of problem-solving dimensions. Here’s what you need to do to rise to the challenge and ace the case:

1. Create case interview structures that meet the AIM test

Of all the case interview assessment dimensions, structuring is perhaps the most challenging, particularly for those who are just starting out. It requires candidates to propose a prioritized and insightful approach to the case that’s composed of a comprehensive set of independent drivers. Structuring plays a foundational role in the interview, setting the course for the entire conversation.

So, what does good case structuring look like? An effective structure should meet the conditions of the ‘AIM’ test. ‘AIM’ stands for:

• Answer-focused: The structure should identify the client’s goal and the question to solve. It should also provide an approach to answering that question.
• Insightful: The structure should be tailored to the specifics of the client or to the problem in question. You shouldn’t be able to apply it to another case of the same type.
• MECE: This is a well-known acronym among consultants. It stands for ‘mutually exclusive and collectively exhaustive’. In plain English, if a structure is ‘MECE’ it has been broken down into an exhaustive set of independent drivers.

2. Know key case interview frameworks

In a case interview, you’ll be asked to structure a variety of problems. There are a number of frameworks that can help you do this, whether the problem you’re structuring corresponds to a common case question or a different topic entirely:

Business frameworks

You can use established business frameworks to craft custom structures for the most common types of case questions. These include frameworks for mastering profitability questions , answering revenue growth questions and nailing market sizing questions .

Academic frameworks

For unusual case questions that don’t relate to an obvious business framework, it can be helpful to draw on an academic framework like supply and demand, ‘the three Cs’, or Porter’s Five Forces. You can learn more about all of these in our ultimate guide to case interview frameworks . The article includes other business and academic frameworks that you can use to craft custom structures for case questions.

Logical frameworks

Finally, logical frameworks can help you look at the big picture in order to structure your approach. These options can be particularly useful when you’re faced with an unusual case question that doesn’t lend itself to a business or academic framework. Some examples of logical frameworks include:

• Structuring with equations: This approach is most helpful for quantitative case questions. Listen out for introductions that focus on a number. These cases can often be broken down into an equation and then structured along its variables.
• Structuring based on hypotheses: This approach is most helpful for structuring qualitative cases. It involves laying out what you most need to believe in order to validate a specific recommendation. These beliefs form your set of key hypotheses, which you then test as you progress through the case.
• Structuring with root causes: This approach works well for structuring cases that require identifying the reasons for a problem. It involves laying out its potential causes in a way that is mutually exclusive and collectively exhaustive (i.e. MECE).

How to apply these frameworks

While business, academic, and logical frameworks can be helpful when it comes to structuring a problem, learning how to use them correctly is a skill in itself. Simply applying a framework to a case interview question in a ‘cookie-cutter’ fashion is not enough. To impress your interviewer and pass the AIM test, your structure will need to be heavily tailored to the situation at hand. In fact, many case questions can be best answered by combining different frameworks.

Ultimately, interviewers want to understand how your mind works and see you think on your feet. You’ll therefore need to demonstrate that you can propose a custom case interview structure to any question.

3. Be comfortable with simple math

Management consulting firms expect you to navigate mathematical problems confidently and reliably in case interviews. Regardless of your academic background or past experience, you’ll need to be able to set an approach to solve the problem, perform calculations quickly and accurately, and state the implications of your solution.

The good news is that you’ll only be required to demonstrate a high-school level of math skills in case interviews. However, with no calculators allowed and an interviewer looking over your shoulder, it’s natural to find this aspect of the experience a little intimidating.

So, what can you expect from case math? The problems you’ll be asked to solve may take the form of straight calculations, exhibits that require calculations, word problems, and estimation questions.

To do well in this part of the case interview, you’ll need to have a strong understanding of:

• The four operations: addition, subtraction, multiplication, and division
• Key math concepts such as fractions, percentages, and weighted averages
• Business math concepts such as income statements, investments, and valuations

To stand out to your interviewer, you’ll also need to work through math problems confidently and efficiently. Here are our top tips for doing this:

• Keep track of zeros: Case questions often involve large numbers, sometimes in the millions or even billions. Keeping close track of your zeros is therefore crucial. We recommend either counting the zeros in your calculation, using scientific notation, or assigning letter units to zeros.
• Simplify your calculations: This will help you work through problems quickly and efficiently while reducing the potential for mistakes. One way of simplifying calculations is by rounding numbers up or down to make them more ‘friendly’.
• Memorize frequently-used fractions: Some fraction values are used so frequently in case math that knowing them – along with their percentage value and decimal conversions – can save you significant time. We recommend memorizing the fraction and corresponding percentage and decimal values of 1/2, 1/3, all the way through to 1/10.

You can learn more in our guide to mastering case interview math .

4. Summarize your findings

Synthesis is a key skill assessed by interviewers, predominantly at the end of a case interview. You need to provide a clear and sound recommendation that answers the overall question convincingly. You must also describe the key supporting points that informed your recommendation and then outline any further steps you would advise the client to take.

When it comes to concluding cases effectively, this four-step framework can be extremely helpful:

• Quickly play the case question back to your interviewer.
• Answer the question directly and briefly by distilling your response into a single sentence, if possible.
• List the points that support your conclusion.
• Outline the next steps that you recommend to the client.

You can learn more in our article on how to conclude a case study interview .

5. Bring it all together with strong case leadership

Case leadership, more than any other dimension, will give your interviewer an indication of how independently you could handle your workstream as a consultant. It’s a particularly important skill in candidate-led cases, where you’ll set the course of the discussion without the interviewer steering you in a particular direction.

Demonstrating strong case leadership means progressing the case efficiently and staying focused on its overarching objectives. Using a ‘tracker page’ to capture your structure and organize your notes throughout the case will help you in this regard.

Another aspect of case leadership is gathering facts effectively. This includes making reasonable assumptions, requesting missing information, and asking probing questions.

Finally, you’ll be expected to build on new findings to develop your recommendation, adapt your approach, and suggest next steps.

Effective case leadership is all about showing your interviewer that you have a strong command of the problem-solving process. After investigating each key driver in your structure, you need to be able to articulate where you are in your overall approach to solving the problem, and what the next steps should be.

To do this, we recommend using a five-step process to handle every kind of analysis you conduct during the case, whether you’re responding to a numerical question, the data in an exhibit, or something else.

Here’s what that five-step process looks like:

• Set your approach. Define what you’re going to do upfront. It’s particularly important to be explicit here, especially if the analysis is in any way complex or ambiguous.
• Conduct your analysis. Your approach here will vary according to the kind of question you’re working through.
• State your findings. You may also want to make a note of your findings on your tracker page.
• State the implications of your findings. Explain how they impact both your answer to the question and the client’s broader goal.
• Suggest next steps. Your findings will sometimes change how you want to approach the rest of the case. This may mean altering your initial structure and editing it on your tracker page.

6. Be your best on the day

When the day of your interview comes around, you’ll want to be at your very best. But what exactly does this mean?

First, you should present yourself in a professional manner. It goes without saying that you should arrive on time but, ideally, you should plan to arrive early. You should also come equipped with the right material: a pen, squared A4 or letter-size paper pad, and copies of your resume. It’s also vital to dress appropriately for the occasion. Usually, this means wearing formal business dress, but this means different attires in different locations. We recommend doing some research to find out what consultants wear at your target firm and office.

To be at your best on the day of your interview, you must be well rested. Sadly, tiredness is one of the most common reasons for underperformance in consulting interviews. The day before is not the time to cram in further preparation. Instead, aim to have a quiet day and to get plenty of sleep at night.

Ultimately, consulting firms want to hire people who can represent the firm and interact with clients at every level, from the shop floor to the C-suite. Successful candidates treat the case interview as an opportunity to play the role of a management consultant advising a client (i.e. the interviewer). This means exhibiting a great deal of confidence and credibility, together with effective communication and an engaging attitude. It’s vital to stay focused on the overall problem and to drive the resolution of the case while being receptive to the interviewer’s input.

There are a lot of balls to juggle in a case interview, with the added pressure of a potentially life-changing outcome, but successful candidates don’t let their nerves get the better of them. We’ve provided some helpful hints and tips in our article on handling the stress of consulting interviews .

Being your best on the day of your interview requires extensive preparation. It means mastering each dimension of the case interview scorecard to the extent that the skills become second nature to you. It also means completing sufficient case practice to be able to focus on the big picture of the case you’re solving, rather than on simply demonstrating a set of skills.

How to prepare for case interview success

Delivering a standard of performance worthy of an offer from a top firm requires extensive case interview prep. In our experience, most successful candidates invest around 60 hours – or 10 hours each week over a six-week period – in their preparation. Failing to put this effort in is among the most common reasons why many candidates are unsuccessful.

Here’s what effective case interview preparation involves:

Learning the skills

In a case interview, your performance is assessed against a set of common problem-solving dimensions. To recap, these are structuring, math, judgment and insights, creativity, synthesis, and case leadership. It’s important to:

• gain a precise understanding of the expectations on each of these skills
• learn the techniques that will allow you to meet these expectations
• practice until your performance meets the required standard

We teach all these skills in our Interview Prep Course . In our bite-sized video lectures, we map out each of the key skills assessed in a case, and explain what you need to know to demonstrate each skill. We also share our tips on how to improve in each dimension, going above and beyond the advice we’ve included in this article.

In addition, our Interview Prep Course includes many more sample interviews that show real candidates – who went on to join top consulting firms – solving cases. Former consulting interviewers explain what the candidates did well on each dimension and where they could have improved.

Math is a critical prerequisite to handling cases and is something you should be comfortable with before you begin practicing. Our Case Math Course – provided as part of the Interview Prep Course – will help you brush up your skills. It contains 21 video lectures that cover everything you need to know, including the four operations, key math concepts, our pro tips, and business math.

After watching all our Interview Prep and Case Math video lectures, we recommend heading to the ‘Drills’ area of CaseCoach, where you can start practicing specific skills. Drills are interactive exercises that pose rapid-fire questions and provide instant feedback. They help you build your skills and confidence in specific case dimensions quickly, allowing you to make the most of your live case practice with partners. Our Interview Prep Course includes a comprehensive set of drills in four key areas: structuring, calculation, case math and chart interpretation.

When it comes to succeeding in a case interview, nothing beats live practice with a partner. Most candidates who go on to receive an offer from a top consulting firm like McKinsey, BCG or Bain complete at least 25 live practice sessions before their interview.

To practice live cases with a partner, you’ll need access to both case material and practice partners. In our Case Library , you’ll find over 100 cases – complete with solutions – developed by former management consultants. You can download eight of these cases right away by creating a free CaseCoach account. You’ll find a diverse community of fellow candidates who are all available for case interview practice in our Practice Room , where we facilitate over 3,000 practice sessions a week.

You can learn more in our article on how to practice case interviews .

Working with a coach

Some candidates choose to supplement their preparations by working with a consulting interview coach who has been an interviewer at a top firm.

These coaches have the skills and experience to gauge your level of performance and help you identify your areas of strength and weakness. They can also provide you with accurate and helpful feedback on your case-solving skills. This insight can help you accelerate your preparation and improve your performance. Getting used to interviewing with a professional should also help to reduce the stress of the consulting interview experience.

Here at CaseCoach, our coaches are all former consultants and interviewers who have been handpicked from the alumni of top firms such as McKinsey, BCG and Bain.

Do your research

Although employers who use case interviews all test candidates using similar methods, none of them approach the interview process in exactly the same way.

For instance, if you expect to interview with McKinsey, Bain or BCG, it’s helpful to know that these firms all give cases of similar complexity. However, there are some key differences. For example:

• Bain has been known to use estimation questions, such as market sizing, in interviews for its most junior (i.e. Associate Consultant level) roles.
• BCG and Bain occasionally use written cases.
• When it comes to the ‘fit’ interview, McKinsey uses its Personal Experience Interview format, while most Bain offices now use a ‘behavioral interview’ . Only BCG consistently uses the classic fit interview format .

Other differences include the number of rounds of interviews each firm conducts, and their preference for using interviewer-led or candidate-led cases. Wherever you interview, it’s vital to do your research and find out what you might be able to expect.

When it comes to getting ready for the case interview, knowing what you will be assessed on, learning how to succeed, and having access to the best practice resources can all go a long way. Now, you need to put in the hard work and prepare! Good luck.

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S T R E E T OF W A L L S

Consulting case study 101: an introduction to frameworks.

Before we look at individual Cases, it is important to begin by looking at analysis frameworks that commonly can be used to address Case Study questions. In this chapter, we will outline some of the core frameworks and some additional Consulting concepts that are important to grasp and will form part of many interviews. The frameworks will be helpful to answer certain types of cases, depending on the type of case.  In reality, few case interviews or real-life business situations cover just one concept or business problem, so you have to have the flexibility to apply a range of concepts/structures.  For example, a Company bringing a new product to market would require a market size analysis, competitor analysis, as well as understanding the key customer segments.

The more you practice, the easier the cases will become and the more articulate and structured you’ll be in your answers.

An important note on this: historically, the vast majority of Consulting candidates have used specific business frameworks to answer cases.  Frameworks remain important as concepts to answer Case Studies, but you should absolutely avoid any rigid use of a specific framework . In reality, the main purpose of learning the frameworks is to help you to structure your answers , just as the case situations in our later examples should do.

The key frameworks that follow should be used directly in certain Case situations , but more broadly they should be used as a way to expand your strategic thinking , which is the critical component of success in the Case Study interview process. Ultimately, a top-flight candidate will build his or her own framework/structure for evaluating the Case as it progresses, often drawing from many of the frameworks and concepts in this module, and potentially others. In other words, you should absolutely avoid using the phrase, “I will apply framework X to this case.” However, be aware of the “famous” frameworks in case they are mentioned in an interview setting, and don’t be shy about referencing them as you dive into the specifics of the Case Study you’re evaluating.

Porter’s Five Forces

Porter’s Five Forces has become an incredibly well known framework in the business strategy world. It is probably the most famous of all of them. It was introduced by Harvard Professor and Monitor Consulting firm founder Michael Porter.  Porter’s Five Forces is a high-level framework that you can draw upon to perform a market landscape and competitor dynamics analysis. It can help determine whether a market or company is attractive, whether the client for whom the analysis is being performed is a private equity firm thinking about buying a company, or a major company thinking about entering or exiting a certain market segment. In most cases, a Case Study will address at least some of the components found in this framework.

Here are the Five Forces in detail:

Porter’s Five Forces

• Legal or regulatory barriers (for example, patents or government contracts)
• Economies of scale
• Cost advantage (for example, unique access to lower raw material costs)
• Access to distribution channels
• Product differentiation (for example, how is this product different?)
• Industry growth rate
• Industry fragmentation
• Level of switching costs
• Motivation to reduce prices (for example, from excess capacity)
• Level of substitute products
• Buyer’s decision influenced by supplier
• Supplier inputs/products have high switching costs
• Supplier has potential to forward integrate
• Supplier accounts for large share of the inputs/products
• High customer/client concentration
• Level of commoditization of product/input
• Level of switching costs for buyer
• Buyer has significant product/market information
• Substitute products/services that can compete on price and/or quality
• Switching costs to shift to substitute products

This simple framework has been around for a long time as a way to think about any industry or company, and applies broadly to a wide range of Case Study questions. If you compare the description below to that of Porter’s Five Forces above, you will see that there is substantial overlap.

The “3 Cs” approach is to address any Case situation by assessing the:

• Competitors
• Customers/clients

The 3 C’s

• Pros and cons of product/service
• Value chain
• Revenue (price × volume) and expenses
• Core competencies
• Regulatory environment
• Distribution network
• Management and core employees
• Market share
• Fragmentation
• Financial situation (for example, deep pocket competitors?)
• Other competencies (for example, marketing or distribution channels)
• Value proposition versus client
• Demographics (age, gender, etc.)
• Value of core customers/clients
• Wants and needs of customers/clients
• Customer/client segment sizes
• Customer/client segment shares
• Customer/client segment growth rate
• Product characteristics
• Personnel (especially for B2B)

This framework is often used specifically whenever there is a marketing component involved in a case (for example: how to increase sales resulting from any profitability optimization case, deciding on an approach to enter a market, etc.). When combined with the 3 Cs, this framework can cover many topics and as you practice more Case Study questions, you’ll develop a better sense of when and how to draw from these frameworks.

The “4 Ps” approach is to address a marketing-oriented Case situation by assessing the:

The 4 P’s

• Commoditized or differentiated?
• How close are the substitutes?
• Value proposition versus substitutes (price, quality, etc.)
• Switching costs
• Why are clients/customers purchasing the product?
• Brand, availability, service, value, reliability, aesthetic, etc.
• Is our product sufficiently better to justify a higher price? Or is it somewhat commoditized?
• Customer loyalty/lock-in
• Supply/demand: current state of demand and supply for the product or service
• Price of substitute products/services
• Price of competitor products/services
• Brand position and perception
• What is the cost for the client to produce the product or offer the service?
• Select/exclusive channels or wide distribution network?
• Seamless delivery to customers
• Internal transport or outsource?
• Specific areas of a site online
• Product placement in stores
• Customer/client awareness
• Is the Company reaching and attracting its target market?
• What are the most effective marketing campaign strategies?
• Return on marketing spend
• Are we retaining our customers/clients?
• Can we up-sell or cross-sell to our current customers/clients?

SWOT (Strengths, Weaknesses, Opportunities, Threats)

SWOT analysis is more of a mini-framework, specifically for quickly evaluating a single company in an industry. In that regard, it’s far less complete than other frameworks, and can often miss important details. However an interviewer could potentially ask you for a SWOT analysis, and you should be prepared to apply it in that case.

SWOT is effectively a quick, high-level market landscape/competitive dynamics analysis arranged using the following terminology:

SWOT Analysis

• Strengths: Company strengths within an industry
• Weaknesses: Company weaknesses within an industry
• Opportunities: Company opportunities available within the industry (or potentially by branching into a new industry)
• Threats: Company threats within the industry (or potentially from companies whose primary business is in another, related industry, or from disruptive technologies that potentially threaten all companies in an industry)

It should be noted that SWOT can be extended from comparing a specific company to the others in the industry, to comparing a specific industry or sub-industry to other, related industries or sub-industries within the economy. For example, a classic SWOT analysis might entail benchmarking Delta Airlines with the airline industry as a whole; an extension could entail benchmarking the entire airline industry against the broad transportation sector.

Other Frameworks

You should be very familiar with the well-known frameworks already discussed in this chapter, although it is unlikely that an interviewer would ask you to use a particular framework in your analysis. Instead, it is typically expected that you draw on the concepts encompassed by these frameworks and/or the concepts that we will outline in the next chapter, which breaks down the common Case Study interview question types .

In addition to these frameworks, there are a number of other frameworks that you will read about on certain Consulting firm sites, but you will probably not be expected to know them in detail or apply them specifically in an interview. It does not hurt, however, to be familiar with them. Therefore, we include these example frameworks for your reference and encourage you to at least familiarize yourself with the basics of them:

• The BCG Growth Share Matrix for evaluating product or business lines
• The McKinsey 7S Framework for evaluating organizational effectiveness
• The Product/Market Grid to determine growth opportunities
• Force Field Analysis for Change Management
• The Affinity Diagram for organizing ideas and information

Additional Analysis Concepts

There are additional, relatively simple analytical techniques that you should be prepared for in Consulting Case Study interviews. These techniques tend to be numerical, and occur frequently, although none are comprehensive or broad enough to fall into the category of a “Framework”:

Break-Even Analysis

Fixed vs. variable expenses, net profit margin, return on investment (roi), compound annual growth rate (cagr).

• Lifetime Customer Value (LCV; sometimes referred to as “User Lifetime Value”)

Product Life Cycle

Opportunity cost, elasticity (supply or demand).

• Financial Statements, Accounting, and Valuation

Let’s take a deeper look at each analysis category.

• The gist of Break-Even Analysis cases is that the Fixed Costs of a business—i.e., the costs that are unavoidable—need to be overcome by making profit from sales of products. Presumably, each incremental sale contributes to profit at a rate that can be determined (or at least estimated); the question that is to be answered is, “How many units do I have to sell in order to overcome my Fixed Costs, i.e., to ‘Break Even’?”
• In other words, the Break-Even Point is the number of units sold at which Revenue equals Total Expenses (Fixed Expenses plus Variable Expenses).
• Break-Even Analysis is often applied when deciding whether to develop a new product or make a capital equipment investment, as well as helping in making decisions around how to price products and service and the number of units to produce.
• Formulaically, Break-Even Number of Units = Fixed expenses ÷ (Revenue per unit – Variable Expenses per unit).
• Note that the expression ( Revenue per unit – Variable Expenses per unit ) is often referred to as the Unit Contribution Margin .
• An understanding of how to analyze Expenses and differentiate Fixed Expenses from Variable Expenses is useful in order to run a Break-Even Analysis of a company.
• Break-Even Analysis can get more complex, as there are microeconomic and macroeconomic considerations that can change both the Fixed and Variable Expenses, but the basic concept is an important one; therefore you will likely come across some form of Break-Even Analysis in Consulting Case Study interviews.
• Note that this concept can also be translated into a question on Break-Even Price , i.e., “Assuming a certain volume of sales, what is the sales price required in order to break even?”
• Formulaically, Break-Even Price = (Fixed Expenses ÷ Sales Volume) + Variable Expenses per unit .
• Note that the expression ( Fixed Expenses ÷ Sales Volume ) equates to the required Unit Contribution Margin at the assumed Sales Volume in order to break even. In other words, Break-Even Price = Required Unit Contribution Margin + Variable Expenses per Unit .
• Fixed Expenses (or Fixed Costs ) are expenses that do typically fluctuate regardless of the production or sales levels. These expenses can be viewed as “unavoidable,” at least in the short-term. Typical examples for Fixed Expenses include Rent, Insurance, Mortgage Payments, and Corporate Overhead Expenses.
• Variable Expenses (or Variable Costs ) are impacted by changes in production or sales levels – typical examples include are Raw Materials, Direct Labor Expenses (wages and benefits), and delivery costs.
• Understanding a Company’s Fixed vs. Variable Cost structure is important in a variety of cases (such as in Break-Even Analysis, discussed above).
• When analyzing a Case, always keep in mind that total Fixed Expenses remain constant as volume rises (or falls), but Fixed Expenses per unit decline as volume rises (rise as volume falls). For example, if a computer component manufacturer has $1,000 of Fixed Expenses and produces 100 components, then the $1,000 of Fixed Expenses will be spread across 100 components (= $10 of Fixed Expenses per unit). If the Company produced 200 components, then the Fixed Expenses per unit would decrease to $5 per unit.
• Variable Expenses, meanwhile, rise proportionately as volume increases, so Variable Expenses per unit remain constant.
• When an interviewer asks a candidate to calculate the Net Profit Margin (a.k.a. Profit Margin or Net Income Margin ), he or she will usually be referring to the total Net Income of a company or business line as a percentage of its Revenue: Net Profit Margin = Net Income ÷ Total Revenue.
• The interviewer could also refer to Gross Profit Margin , which is simply Gross Profit as a percentage of revenue: Gross Profit Margin = Gross Profit ÷ Total Revenue
• Similarly, the interview may also refer to Operating Profit Margin ( EBIT Margin ), or EBITDA Margin . In both cases, thus is simply the figure in question (Operating Profit, a.k.a. EBIT, or EBITDA) as a percentage of Revenue.
• Return on Investment (ROI) is a ratio that determines the return, or Profit, from capital invested. ROI is used in consulting interviews as a way to evaluate the return of a particular investment or to assess the feasibility of a potential investment or acquisition. Many companies have an internal ROI metric for capital investments.
• Standard ROI is calculated as follows: Profit from the Investment (Revenue minus Costs) ÷ Capital Invested .
• Note: Return on Assets (ROA) is a variation of this concept, but instead revolves around all capital invested in a project (Liabilities + Equity), rather than just Equity invested, which is typical for an ROI calculation.
• The Compound Annual Growth Rate (CAGR) is the percentage rate at which any figure, such as number of units sold, a population, or an investment must grow in each year to reach a given end value over a certain amount of time. (Note that this is not the only growth path to grow from a beginning number to an ending number, but it is the only growth path that is the same growth rate every year .)
• The formula to calculate CAGR is: [(Ending Value ÷ Beginning Value)^(1 ÷ Number of Years)] – 1.
• For example: If sales grew from $1,000 in the year 2001, when a store opened, to $2,100 in 2012, what is the CAGR?
• Answer: [(2,100 ÷ 1,000)^(1 ÷ 11)] – 1 = 2.1^(0.090909) = 7.0%
• Thus, the CAGR between 2001 and 2012 was 7.0%.
• CAGR is very similar in concept to Internal Rate of Return (IRR), which is the annual rate of return on an investment if its value grows by a specific multiple over a specific amount of time.
• Use the Rule of 72 to estimate CAGR whenever possible. The rule of 72 simply states that a quantity will roughly double in value whenever the number of years times the annual growth rate equals 72.
• Using the above example, we can see that the quantity slightly more than doubled, so the answer should be slightly above (72 ÷ 11) percent, or slightly above 6.6%. Indeed, it is!

Lifetime Customer Value (LCV)

• Lifetime Customer Value (LCV) projects the total profitability attributed to a firm’s future relationship to a typical customer.
• The idea behind this microeconomic analysis is to determine the reasonable cost to win or acquire a customer (or to maintain an existing customer, i.e., prevent him or her from “churning,” or switching to a competitor). It can also be used to determine level and type of customer service to provide, and as another way to estimate the value of a business. (In theory, the value of a business should equal the number of existing customers × the LCV per customer , plus growth opportunities.)
• The steps to calculate the LCV are as follows:
• Estimate the remaining customer years; in other words, how long is a typical customer expected to last with the company?
• Estimate future Revenue per year per customer, based on product volume per customer × price
• Estimate Total Expenses for producing those products (either separating Fixed Costs out or allocating them on a per-customer basis)
• Calculate the Net Present Value of the future profit (Revenue – Expenses) per customer (in other words, discount these future profits back into today’s equivalent dollars)
• Important for market sizing problems, the Product Life Cycle helps to calculate and project the annual market size for a given market/industry. It is often used by companies to project their own anticipated Revenue figures.
• Formulaically, Annual Market Size = Total Revenue of a product outstanding ÷ Average life of the product . For example, “Total Revenue of a product outstanding” might represent the sticker price of all cars driven in the US, while the “Average life of the product” would be the average number of years a car is driven.
• It is also worth knowing the four steps in the Product Life Cycle Curve , as the concept could come up in a hypothetical product case.
• Emerging: A new product or technology that is in initial adoption phases and therefore has very rapid growth rates (for example: electric cars)
• Growth: Product adoption is becoming widespread but still growing at an above-average rate (for example: smartphones)
• Maturity: Product adoption is widespread, or at least stabilized; growth typically comes only from price increases and growth in GDP (for example: breakfast cereal)
• Declining: Technological obsolescence, shifting consumption patterns, or increased market competition has resulted in total growth rates that are below-average or negative (for example: dairy products or wireline telephones)
• Opportunity Cost simply refers to the concept that if a person or company does X , the person or company necessarily cannot also do Y .  This is an important concept throughout business and consumer decision making, as there are only finite resources available in most cases (time, money, etc.).
• Thus, for example, it is unwise for a company to invest $1 million in a project earning $3 million if that same investment prevents it from investing the $1 million in another opportunity that would earn $10 million. In this case, the Opportunity Cost can be defined as the loss of incremental profit of $7 million ($10 million potential profit lost minus the $3 million earned).
• If X does not prevent also doing Y , then there is said to be “no Opportunity Cost” of doing X with respect to Y . In the above example, if the company had $2 million to invest and the capacity to manage both projects, it could reap the profits from both projects, i.e., $13 million.
• Elasticity is a concept from microeconomics that describes the tradeoff between Quantity and Price.
• Specifically, Elasticity is the ratio of a percentage change in quantity to the percentage change in price. Formulaically, Elasticity = % Change in Quantity Demanded or Supplied ÷ % Change in Price .
• For example, if an increase in the price of oranges from $1.00 apiece to $1.50 apiece causes demand for those oranges to fall from 100 units to 80 units, then the % Change in Quantity = –20% and the % Change in Price = 50%. Therefore the Elasticity of Demand = (–20 ÷ 50) = –0.4.
• Note that for normal goods, Elasticity of Demand will always be negative (higher prices mean less quantity is purchased) while Elasticity of Supply will always be positive (higher prices mean that suppliers are willing to produce and/or supply more goods).
• The concept comes up in multiple types of cases, such as pricing optimization. Clients often ask what the impact would be on volume if they adjust the price. Usually the correct answer is to increase prices in Inelastic markets (price increases lead to a relatively small decrease in products sold) and decrease them in Highly Elastic markets (price increases lead to a large decrease in product sold).

Financial Statements, Accounting and Valuation

Unlike Investment Banking interviews, which can be detailed and highly technical in terms of Finance and Accounting, Consulting interviews and the Consulting job itself revolve much more around estimation and exercising business judgment and “what-if” analysis. Rarely would a Consultant be called upon to develop and maintain a detailed, precise financial model for Discounted Cash Flow valuation, for example.

That being said, a basic-to-moderate understanding of the Income Statement, Balance Sheet and Statement of Cash Flows, and how they work together, is very relevant to many interviews. (You might even be provided with a basic Income Statement or Balance Sheet of a company as part of a Case Study interview question.)

Rather than reinventing the wheel and writing content on Finance and Accounting in this guide, we recommend you review any standard, basic Financial Accounting textbook to familiarize yourself with the components of basic Financial Statements:

• Income Statement (Revenue, Expenses, and Profit)
• Balance Sheet (Assets, Liabilities, and Equity)
• Statement of Cash Flows (Cash Flows broken out into the following categories of sources: Operating Activities, Investing Activities and Financing Activities)

We also recommend that you familiarize yourself with some basic core Finance concepts (Net Income, EBIT (Operating Profit), EBITDA, Free Cash Flow, Internal Rate of Return, Net Present Value, and Enterprise Value are good places to start) and core Valuation techniques (Cost of Capital, Comparable Company Analysis, Precedent Transaction Analysis, Discounted Cash Flow analysis, and Leverage Buyout analysis).  Although these concepts will not be tested and do not form a major part of general Consulting Case Study interviews, these topics can appear in a general discussion about a particular business situation and you should be able to discuss them at least on a basic level.

If you are applying for a job in Business Development, or for a Consulting position in a Corporate Finance group or at a firm that does a lot of Corporate Finance Consulting work, then you should definitely study up and be prepared for these core Finance and Accounting concepts, because they will likely be tested on in detail in your interviews. In addition to introductory Finance and Accounting textbooks, we highly recommend that these candidates read the Street of Walls Investment Banking Technical Training guide, which addresses complex details around Financial Statements, Accounting and Valuation at a very detailed level. (We also recommend this training guide in general to anyone who is interested in advancing their Finance and Accounting skills—particularly when it comes to Corporate Valuation.)

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Call for applications: Health Research at the Nexus of Humanitarian Crises and Climate Change

The Fogarty International Center of the U.S. National Institutes of Health (NIH) and partner organizations will host a Global Forum on Humanitarian Health Research (GFH2R) inclusive of public webinars and an in-person meeting in May 2025 (dates TBD) in Nairobi, Kenya.

GFH2R seeks to bring researchers and humanitarian organizations (including NGOs, local policymakers, and international agencies) together to share experiences and promote collaboration around health research in humanitarian settings. The theme for GFH2R 2025 is Health Research at the Nexus of Humanitarian Crises and Climate Change.

All interested applicants should review the information below and submit an application no later than October 7, 2024 on the application website . Note: Case study presenter applications will include a brief proposal.

This notice includes details on the following:

About GFH2R

Background and theme, case study overview, call for applications, eligibility, selection criteria.

• Application Checklist

Steering Committee

Definitions.

For questions about the call for applications or GFH2R, please email [email protected] .

For technical questions regarding the application submission system, please email [email protected] .

Humanitarian crises—including those resulting from armed conflict, forced migration and displacement, natural hazards, large-scale epidemics, and climate change—continue to proliferate globally and impact more people today than at any point in recorded history. To better meet the health needs of people affected by these events, humanitarian organizations need to act on reliable evidence. Unfortunately, there is limited scientific evidence available for these organizations to draw upon. Conducting health research in a humanitarian context is complex and uniquely challenging and has often been limited to small-scale pilots or evaluation in the past, which has resulted in a significant gap in evidence available to inform humanitarian policy and practice.

The Global Forum for Humanitarian Health Research (GFH2R) is a unique effort to address this gap. The Forum seeks to bring researchers and humanitarian organizations (including NGOs, local policymakers, and international agencies) together to share experiences and promote collaboration around health research in humanitarian settings. The 2025 meeting will be built around case study presentations by researchers from regions of the world affected by humanitarian crises. The Forum prioritizes the participation of researchers from low- and middle-income countries (LMICs), encourages networking and mentoring, and creates a venue for open and inclusive discussions.

GFH2R 2025 will consist of a series of public webinars and an in-person meeting in May 2025 (dates TBD). Compared to traditional scientific meetings, GFH2R is unique in that it is limited in size and built around small group discussions of case studies that are presented by researchers from settings affected by humanitarian crises. This format encourages open debate from varied perspectives, highlighting the voices of LMIC researchers. The model facilitates opportunities for networking amongst diverse participants for whom few formal, structured venues for interaction currently exist. Additionally, the involvement of research funders in the meeting will raise awareness among researchers of funding opportunities and help funders understand the unique challenges of humanitarian health research.

GFH2R is hosted by the Fogarty International Center at the U.S. National Institutes of Health in collaboration with the International Development Research Centre and Elrha.

Humanitarian crises are occurring in the context of climate change and its environmental consequences, such as increasing sea levels, temperatures, extreme weather events, droughts, flooding, and wildfires, all of which impact human health and livelihoods (see reference 1 ). Some consider climate change itself to be a humanitarian and health crisis, with increasingly complex, frequent, and unpredictable climate risks that compound existing vulnerabilities and inequities within populations and cause cascading emergencies across different systems and sectors (see reference 2 and reference 3 ). The evidence base on the links between climate change and human health has emphasized the meteorological impacts of climate change on adverse physical health outcomes, including infectious diseases and respiratory, cardiovascular, and neurological outcomes (see reference 1 ). However, much of this evidence draws from studies in high-income countries (see reference 4 ). There is a dearth of evidence from low- and middle-income countries (see reference 2 ), which have contributed the least to climate change but often bear the brunt of increasingly catastrophic events (see reference 5 ). There is also limited evidence on the impacts of climate change on mental health and broader social well-being (see reference 1 ).

Conducting health research in the context of humanitarian crises is already extremely challenging. Researchers may need to deal with safety and security concerns, political sensitivities, damaged or overwhelmed health systems, and a wide range of logistical challenges. Climate change acts as a “threat multiplier” and exacerbates the vulnerability of populations, making research in these contexts even more difficult.

In response to these realities, the theme of GFH2R is “Health Research at the Nexus of Humanitarian Crises and Climate Change.” The in-person meeting will be built upon in-depth case studies that describe research conducted at this nexus and share the challenges faced and strategies utilized by research teams.

Case Study Structure

For the purposes of GFH2R, a case study is a concise write up that provides insight into the planning and implementation of a funded research study. The case study will highlight challenges experienced and strategies employed throughout the research process. Unlike a traditional research paper focused on results and outcomes, a case study will provide an in-depth description of the research process and decision points throughout the study.

GFH2R case study proposals should describe an example of health research conducted at the nexus of humanitarian crises and climate change. Ideally, case studies should examine one of the sub-themes listed below but they may explore more than one sub-theme Case study applications are also free to explore the intersection of two sub-themes or discuss other issues associated with conducting health research at the nexus of humanitarian crises and climate change beyond the sub-themes listed. Case studies should be relevant to research in LMICs. 

• For more information on the GFH2R theme and sub-themes, please refer to the GFH2R Background Paper [PDF] .

GFH2R Meeting Sub-Themes

• Community engagement in research
• Equity in global research partnerships
• Academic-humanitarian collaboration
• Research methods innovation and adaptation in humanitarian settings
• Evidence use

Case study applications can be submitted under one of two categories:

• Research that is funded and will be complete by January 2025 or
• Research that is funded and still in progress after January 2025 that could benefit from feedback. 

Case study applications should not be based on research ideas or concepts that have not yet been implemented. However, applicants interested in sharing and discussing research ideas for future work should apply as a general participant as there will be other opportunities for these discussions during the in-person component of GFH2R.

For the purposes of GFH2R, “research” is inclusive of quantitative research, qualitative research, and mixed methods research, in addition to operational research.

GFH2R is seeking two types of participants for the meeting:

• Case study presenters will receive informal mentoring prior to the Forum and present case studies of their research experiences during the Forum.
• General participants will be selected based on geographic, disciplinary, and experiential diversity, to join the meeting and participate in small group discussions and networking activities.

Case Study Presenters

We invite applicants to submit case studies that highlight issues related to conducting health research at the nexus of humanitarian crises and climate change. We welcome health-related case studies from various perspectives, including researchers, policymakers, practitioners (including clinicians and healthcare workers), government representatives, humanitarian NGOs, and intergovernmental organizations. Priority will be given to applicants from LMICs, though applicants from high-income countries (HICs) may also apply and are encouraged to discuss the relevance of their work for research in LMICs.

Selected case study presenters will be paired with a mentor from the GFH2R Steering Committee to help develop their application into a brief paper (2-3 pages) and a PowerPoint presentation. During the GFH2R meeting, case study presenters from around the world will share their presentations and discuss cross-cutting issues. The meeting will also feature keynote speakers and networking opportunities.

Case study presenters can apply as teams of two individuals for a joint presentation. All case study presenter applicants must be meaningfully involved in the research that is presented.

General Participants

In addition to case study presenters, general participants will be selected by the Steering Committee to attend the in-person component of GFH2R. General participants will be selected to ensure broad geographical representation, a mix of disciplinary expertise, and a combination of people who are early in their careers and leaders in their fields. These individuals will be expected to participate in discussions, attend presentations, and join networking activities. There may also be informal opportunities for these individuals to present their ideas for future work at the meeting.

Applicants from HICs and LMICs are welcome, although priority will be given to applicants from LMICs and researchers who are living in the country or region affected by crises. Applications are welcome from all career levels, although early- to mid-career scientists or those who are new to the field of humanitarian health research will be prioritized. Applicants are not limited to academic researchers; staff from government, non-governmental organizations (NGOs), and private sector organizations are also encouraged to apply as long as their applications are focused on research.

All applicants must be able to submit an application in English, as GFH2R 2025 will be primarily held in English.

Note that travel to GFH2R, lodging, per diem, and visa costs for all accepted applicants (both case study presenters and general participants) will be fully sponsored.

The GFH2R Steering Committee will select successful case study presenters based on the following factors:

• Relevance of the case study to the meeting theme of “Health Research at the Nexus of Humanitarian Crises and Climate Change” and extent to which the proposed case study discusses how climate risks are compounding existing vulnerabilities and health impacts of humanitarian crises
• Scientific and public health significance of the case study for the field of humanitarian health
• Case study location (preference will be given to locations that are underrepresented in existing literature, e.g., LMICs)
• Diversity of the submitting applicant or team in terms of geographic location and area of expertise (preference will be given to applicants under-represented in the field).

Successful case presenter applicants are expected to fully participate in all mentorship activities and the complete in-person meeting.

The GFH2R Steering Committee will select successful general participants based on the following factors:

• Geographic location : Applications will be selected to ensure a representative distribution of participants from different regions of the world.
• Background/current area of expertise : Applicants will be selected for a diverse representation of different disciplines.
• Experience conducting research in the context of humanitarian settings : GFH2R is intended for early- to mid-career scientists or those who are new to humanitarian health research, though applications are welcome from all career and expertise levels.
• Reasons for attending the meeting : Participants should benefit from participating in the Forum and be able to actively contribute to discussions at the meeting.

Case study applicants who are not selected will automatically be submitted for consideration as general participants.

Applications are due by 23:59 ET (USA) on October 7, 2024.

All case study applicants will be informed of the Steering Committee’s decision in November 2024. All general participant applicants will be informed of the Steering Committee’s decision in December 2024. The decision of the committee will be final.

Tentative timeline

• August 2024 – Call for applications opens
• October 7, 2024 – Call for applications closes
• November 2024 – Case study applicants informed of status
• December 2024 – General participant applicants informed of status
• February – April 2025 – Steering Committee provides informal mentoring to presenters to develop and strengthen their case studies
• May 2025 – GFH2R (Dates TBD)

Application checklist

To apply as a case study presenter or general participant, visit the application submission site . Please use the following checklist to make sure you have provided all the requested information in your application, in English.

Deadline: Applications are due by 23:59 ET (USA) on October 7, 2024.

If you are unsure about the suitability of a case study application or would like to discuss your proposed case study further, please email [email protected] .

For technical questions regarding the application submission process, please email [email protected] .

Please ensure you include all the requested information as incomplete applications cannot be considered (see the checklist below). Applications received after the deadline will not be considered.

All applicants

All applicants must submit the following information:

• Contact information (email, phone)
• Affiliation/institution
• Country of residence and country of citizenship
• Highest degree earned
• Career level and discipline of expertise
• Why do you want to participate in the GFH2R meeting? (200-word limit)
• What would you uniquely contribute to the GFH2R meeting as a participant? How would you share meeting takeaways with your institution and local/regional partners? (400-word limit)
• Curriculum vitae (CV) or resume (5 pages maximum)

Case Study Presenter applicants

In addition to the items listed above, case study presenter applicants must submit a Case Study Proposal (2 pages maximum) which includes the following information:

• Name of partner if applying to present as a team (2 people max)
• Names of key collaborators and all relevant partners involved in the research
• Please indicate if the research study will be complete by January 2025 or still in progress after January 2025.
• Identify source of funding support
• Identify selected major sub-theme
• Identify selected minor subtheme(s) if applicable or other areas/topics explored
• Research question explored
• Public health challenge or disease area studied
• Importance of study
• Brief overview of results
• Location of study (if different from your own country of residence or citizenship, explain your connection to study location)
• Description of the humanitarian crisis
• Explanation of relevant climate risks/context affecting the study population
• Relevant facts about the host country/community
• Discussion of research issues. Refer to the theme descriptions and sub-themes for questions that could be addressed in this section.
• Conclusions and two lessons learned to be shared as recommendations with other researchers.
• Adam Levine, Brown University School for International and Public Affairs
• Catherine Lee, International Rescue Committee
• Chaza Akik, Independent public health research consultant
• Eliana Martinez-Herrera, National School of Public Health, Universidad de Antioquia
• Gillian McKay, Elrha
• Irene Torres, Inter-American Institute for Global Change Research
• John Jamir Benzon Aruta, De La Salle University
• Jura Augustinavicius, McGill University School of Population and Global Health
• Manuela A. Orjuela-Grimm, Columbia University
• Marie Roseline Darnycka Belizaire, World Health Organization
• Miriam Orcutt, World Health Organization
• Montasser Kamal, International Development Research Centre
• Patrick Opiyo Owili, African Population and Health Research Center
• Sabina Faiz Rashid, BRAC James P Grant School of Public Health, BRAC University
• Sasha Fahme, Weill Cornell Medicine
• Shannon Doocy, Johns Hopkins Bloomberg School of Public Health
• Thandi Kapwata, South African Medical Research Council
• Veena Pillai, Médecins Sans Frontières/Diode Consultancy
• Yasser Kamaledin, Médecins Sans Frontières – Netherlands

The following are definitions of some of the key terms related to the scope of the meeting and theme developed for the purposes of GFH2R.

Climate change refers to changes in global or regional climate patterns attributed largely to human-caused increased levels of atmospheric greenhouse gases and planetary warming. Climate drivers affect health outcomes directly through weather events such as extreme heat, wildfires, droughts, storm surges, and floods, but also indirectly through a series of exposure pathways such as air and water quality, food quality, infectious diseases, and massive population displacement events (see reference 6 ). Climate change can act as a cause of humanitarian crises and/or as a threat multiplier of health risks in humanitarian settings.

Humanitarian crises involve sudden or protracted events that disrupt and threaten lives and livelihoods on a large scale and require extensive assistance and/or response, broadly including armed conflict, forced migration and displacement, refugee crises, natural hazards and disasters (e.g., extreme weather events, earthquakes, and droughts), large-scale epidemics, and disease outbreaks.

Humanitarian health research is inclusive of health research conducted in the setting of a humanitarian crisis and/or health research with a population directly affected by a humanitarian crisis (e.g., a refugee population fleeing conflict, relocated to a more stable setting, which may be in LMICs or high-income countries (HICs)). Such research may explore the effects of humanitarian crises on health systems or populations in specific contexts.

Humanitarian settings include locations where humanitarian crises have occurred or settings with populations directly affected by humanitarian crises (e.g., a setting where refugees fleeing conflict reside).

Low- and middle-income country (LMIC) refers a country categorized in “low-income economies,” lower-middle-income economies,” or “upper-middle-income economies” based on gross national income per capita by the World Bank. We recognize this terminology is not ideal and fails to account for many of the nuanced differences between nations. For consistency however, this language matches the current general NIH terminology used in NIH program announcements and funding opportunities. It is not intended to promote a hierarchy between different countries based on economic status.

Note on Privacy GFH2R understands the delicate balance between protecting data collected and permitting access to those who need to use the data for authorized purposes. The primary use of this information is to identify candidates for participation in the GFH2R meeting. GFH2R and its Steering Committee will take every reasonable precaution to protect your information by maintaining appropriate physical, electronic, and procedural safeguards to ensure the security, integrity, and privacy of your personal information. Additional information regarding CRDF Global’s Privacy Policy can be found here.

• Rocque RJ, Beaudoin C, Ndjaboue R, Cameron L, Poirier-Bergeron L, Poulin-Rheault RA, et al. Health effects of climate change: an overview of systematic reviews. BMJ Open. 2021;11(6):e046333.
• Baxter L, McGowan CR, Smiley S, Palacios L, Devine C, Casademont C. The relationship between climate change, health, and the humanitarian response. Lancet. 2022;400(10363):1561-3.
• Romanello M, Di Napoli C, Drummond P, Green C, Kennard H, Lampard P, et al. The 2022 report of the Lancet Countdown on health and climate change: health at the mercy of fossil fuels. Lancet. 2022;400(10363):1619-54.
• Berrang-Ford L, Sietsma AJ, Callaghan M, Minx JC, Scheelbeek PFD, Haddaway NR, et al. Systematic mapping of global research on climate and health: a machine learning review. Lancet Planet Health. 2021;5(8):e514-e25.
• Health, Wellbeing and the Changing Structure of Communities. In: Intergovernmental Panel on Climate C, editor. Climate Change 2022 – Impacts, Adaptation and Vulnerability: Working Group II Contribution to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge: Cambridge University Press; 2023. p. 1041-170.
• Climate Change and Health Initiative Strategic Framework. National Institutes of Health; 2022.

More Information

• Global Forum on Humanitarian Health Research (GFH2R)
• Advancing Health Research in Humanitarian Crises
• Center for Global Health Studies

Updated August 2, 2024

Machine Learning-Aided Understanding of Structure-Activity Relation: A Case Study of MoS2 Supported Metal-Nonmetal Pair for Hydrogen Evolution Reaction

Understanding the structure-performance relation is crucial for designing highly active electrocatalysts, yet this remains a challenge. Using MoS2 supported metal-nonmetal atom pair (XTM@MoS2, TM = Sc-Ni, X = B, C, N, O, P, Se, Te, S) for hydrogen evolution reaction (HER) as an example, we successfully uncovered the structure-activity relation with the help of density functional theory (DFT) calculations and integrated machine learning (ML) methods. A ML model based on random forest regression was used to predict the activity, where the trained model exhibited excellent performance with a small error. SHapley Additive exPlanation analysis revealed that atom mass and covalent radius of X atom (m_X and R_X) dominate the activity, and the higher values usually lead to better activity. In addition, four promising candidates, i.e, PCr@MoS2, SV@MoS2, SeTi@MoS2, and SeSc@MoS2, with excellent activity are selected. This work provides several promising catalysts for HER, but more importantly, offers a workflow to explore the structure-activity relation.

Supplementary files

• Supplementary information PDF (2285K)

Article information

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A. Chen, J. Sun, J. Guan, Y. Liu, Y. Han, W. Zhou, X. Zhao, Y. Wang, Y. Liu and X. Zhang, Nanoscale , 2024, Accepted Manuscript , DOI: 10.1039/D4NR02112F

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Case Interview Types: Master Common Ones Before Your Interview

• Last Updated January, 2024

Rebecca Smith-Allen

Former McKinsey Engagement Manager

On Case Study Preparation , we described what a case interview question is and how you should approach answering one. You can think about that page as your Consulting Case Interview 101 course.

But if we could tell you how to ace your consulting case interview in just one page, Bain, BCG, McKinsey, and other top consulting firms would give out a lot more offers than they do every year.

On this page, we discuss the most common types of case study interview questions . We’ll take your understanding of how to answer these to the next level by outlining the key issues to consider when structuring your answer.

Let’s get started!

Here are the types of cases you might come across during your case interview :

• Profitability Cases 1.1 Profit Optimization 1.2 Revenue Growth 1.3 Pricing Optimization 1.4 Market Entry 1.5 M&A 1.6 Cost Optimization 1.7 Startup / Early-Stage Venture
• Non-Profitability Cases 2.1   Lives Affected 2.2 Retention 2.3 Industry Landscape and Competitive Dynamics
• Market Sizing Questions (also called dinner conversation cases)
• Case Interview Math (also known as consulting math) 4.1 Consulting Math Example 4.2 Summary of Key Things to Remember on Consulting Math Questions

How To Make the Most of Case Interview Practice Time

Help with case study interview preparation.

Nail the case & fit interview with strategies from former MBB Interviewers that have helped 89.6% of our clients pass the case interview.

Profitability Cases

On this page , we discussed case interview  frameworks   that can help you structure your answers to case study interview questions, we introduced the profitability equation. It’s 1 of 2 basic business frameworks you can use to answer any type of case question. 

This formula can help ensure you address all the key aspects of straightforward profitability cases like the following:

A sports apparel retailer has experienced declining sales in its stores over the past year and declining profits. How would you recommend they address their profitability problem?

A cell phone manufacturer is experiencing declining profitability despite strong sales. What should they do to improve their bottom line?

For more detail on the components in this formula and an example of how to use it to solve a case interview question, see our  Case Interview Frameworks  page . Below, we’ll discuss types of profitability problems that go beyond the basics.

Profit Optimization

Perhaps a company is profitable… just not profitable enough . 

Maybe its margins are lower than those of an industry rival. 

Maybe they’ve dipped below its own prior-year performance. 

Perhaps management sees an opportunity to launch a new product, leapfrogging the competition, but needs to generate more cash to invest in development. 

Any of these can be reasons to improve the performance of an already profitable company. 

Sample questions:

A nationwide fast-food chain failed to meet Wall Street expectations on its latest investor call and as a result, its stock price fell significantly. Management wants help identifying opportunities to improve the bottom line.

The CEO of a regional hospital chain is concerned that his company’s profitability is half that of the market leader. How can the company grow its net income?

Use the Profitability Equation

In structuring your analysis of a profit optimization case, you should touch on all 4 components of the profitability equation to understand what the company is doing well and where things have taken a turn for the worse. 

But the underlying problem in this type of case may be more subtle than in a basic profitability question. 

Instead of a big jump in costs or the loss of a large customer wiping out a significant chunk of revenue, the company may be experiencing a couple of small problems that add up to bad news for the bottom line. 

Benchmark Relative to Competition of Past Performance

For example, if our client is a TV manufacturer and we find out that our cost of producing a TV has increased overtime while our prices have remained the same, we can see that rising costs is the reason for our profits declining. 

To turn around the situation, we could look into what the competition is doing to reduce costs. For example, if a competitor is sourcing the same materials as us but from a cheaper supplier, we want to see if we can lower our cost by sourcing from the same supplier.

Benchmark One Business Segment to Another

Another way consultants benchmark performance on revenue and cost levers is by comparing the performance in one business segment or type of end-customer to another . 

Continuing with our TV manufacturing example, we might find that the client has seen costs rise on components in its high-end models but remain constant for its low-end models. 

We can look into what is being done differently in the low-end product group: low-cost sourcing, process improvement, etc. to find opportunities to improve the cost position in the high-end segment.

Use Key Performance Indicators (KPIs)

The company may also need more disciplined business processes and a system for measuring key performance indicators . 

Our TV manufacturer might institute a system for measuring cost per unit on a weekly or monthly basis in order to ensure they have an early warning system to monitor if costs are getting out of line.

To go with these KPIs, a regular process for reviewing the costs and taking necessary action could be instituted. Disciplined processes and performance indicators will help to fine-tune operations over time, taking them from good to best-in-class.

Key concepts to consider when addressing a profit optimization case:

The profitability equation including all its components,

• Benchmarks of cost and/or revenue relative to best-in-class competition and prior year performance.  
• Benchmark the company’s performance segmented by product or type of customer .
• Opportunities for business process improvement and key performance indicators that will allow management to monitor profitability more closely. 

Revenue Growth

Revenue growth case questions focus on companies that, while already profitable, still want to grow. 

They can do this by increasing market share, by selling their existing products to new markets, by selling new products to their existing customers, or by pursuing a combination of these opportunities. 

They can also capture more revenue by increasing prices.

A national chain of fitness centers wants to leverage its brand equity by selling additional products and services to its client base. What incremental products and services can profitably grow revenue?

The president of a printer and ink manufacturer thinks there is an opportunity to provide after-sale service to its customer base. What might be the impact on revenue from entering this market?

Capture Additional Market Share

As its name suggests, this type of case study focuses on the first half of the profitability equation — revenue = price x quantity of units sold. in examining units sold, you should consider the company’s ability to capture additional market share for existing products in the markets it already serves. , what is the company’s current share of the market that of its largest competitor what would it take to capture additional share product improvements a shift in marketing and promotion.

If a chain of fitness centers was our client, for example, we’d look at whether the primary competition was 1 or 2 large chains or a number of small, single-location gyms and tailor our strategy to increase market share accordingly. 

If the competition was single-location gyms, we could promote flexibility for members to use our facilities in multiple locations to bring in new customers. We could also leverage the client’s greater size to outspend the small gyms on advertising.

Branch into New Products or Markets

Also, consider the new products and/or markets the company could branch into . What products do competitors sell that the company doesn’t? Does the company have capabilities that would help them  succeed in other markets?

Our fitness center client could consider selling new products like fitness apparel or vitamins. They could expand into new markets, such as towns and cities adjacent to ones currently served.

Offer Services to Existing Customers

In addition, consider  services that can be sold to existing customers . Post-sales support for equipment, for example. Or consumables used with their products, like ink for a printer manufacturer. Our fitness center client could look into providing personal fitness coaching services to members.

Review Pricing

Lastly, consider the company’s  flexibility to raise prices . Where do their prices stand relative to competitive products or services? Do their products or services have higher quality or value-added capabilities that would command a higher price?

For more examples of revenue growth case interviews, see our  Revenue Growth Case article. 

Pricing Optimization

A company must have a solid product or service offering to be able to take a price increase without seeing a significant loss of sales to competitors. 

If their products or services are strong, then optimizing price can be an important lever to grow revenue.

A manufacturer of kitchen knives sells a range of products, from low-end to professional, to customers at different price points. They’ve developed a new line of knives in collaboration with a celebrity chef and would like help setting the prices for these products.

The airline industry has experienced significant changes in its pricing model over the past few years, with some airlines charging separately for checked baggage, meals, and beverages. A global carrier has asked us to help optimize the pricing of the additional services it provides to customers who fly with them.

Elasticity of Demand

When prices rise, demand for a product goes down and when prices fall, demand rises. You’ll remember this from Economics 101, or perhaps just from common sense. Pricing optimization is all about how much . 

If you can raise prices with demand going down just a little, you can improve a company’s revenues by raising price. If a change in price has a big impact on demand, then raising price could be a big mistake.

The term for this is Price Elasticity of Demand . If demand for a product or service changes a lot in response to a change in price, it’s said to have price elasticity. Products with many substitutes or ones that consumers can easily do without are the most sensitive to price changes. 

For example, if McDonald’s raised the price of the Big Mac, more customers might go to Burger King, Taco Bell, or just eat lunch at home. McDonald’s hamburger sales would fall dramatically.

Substitutes

For some products, demand is relatively insensitive to changes in price. This can be the case for luxury goods, for products that have few substitutes , or for when there are large switching costs. When the cost of home heating oil rises, some customers consider switching to natural gas to heat their homes. But if doing so will require buying a new furnace to run on gas or paying for pipes from their house to the gas distribution network, they won’t make the change unless the change in price is dramatic and/or expected to persist for a number of years. 

3 Methods for Setting Prices

Competitive-based pricing — Setting prices based on the prices of other similar products in the market. This is the simplest method for setting prices. Companies who use competitive-based pricing are price takers.

Cost-based pricing —Setting prices as a function of the cost to provide a good or service plus a profit margin. Cost alone can’t be used to set pricing because if a company’s costs are out of line with its competitors, it may price itself out of the market.

Value-based pricing — Setting prices based on the value provided to customers. Luxury goods are priced well above the cost of their production because customers of these products value association with the prestigious image the product conveys. Products that provide significant value to customers in terms of saving time or providing features not found in other products can be priced higher because they are worth more to customers.

Value-based pricing the best pricing method but it can only be used for products and services that are sufficiently differentiated in the eyes of the customer that they will not change their buying behavior in response to higher prices.

Market Entry

Significant start-up costs will be incurred to develop and manufacture a new product, to launch the marketing campaign, or to build the sales force needed to find customers. 

To ensure that spending money on start-up costs are worthwhile, due diligence needs to be done to estimate the size of the market being considered and the cost of successfully entering it.

A teen fashion retailer has seen its sales boom in the North American market for the past 5 years. They’re considering expansion into international markets. They’d like help identifying which markets provide the best opportunities for their line of clothing.

A not-for-profit organization has been successful at hiring the long-term unemployed to manufacturer furniture made from pallets and other recycled items. They’ve not only designed and created beautiful pieces of indoor and outdoor furniture, but also helped to improve the lives of individuals in one city. They’d like to expand to other products and potentially to other cities and have asked for our help in assessing their options.

There are  4 parts to any market entry case : market size, market attractiveness, costs of entry and capabilities required. Let’s look at each.

Market size

Market sizing is sometimes used as a case interview question on its own. See below for more details . It’s also usually the first part of a market entry case. It addresses how large a market is in terms of annual revenue, number of units sold, or both. The underlying issue is whether there is enough opportunity in a market to make it worth the up-front cost.

To determine whether the amount of sales revenue or unit volume is “enough,” estimate the size of the market based on the information provided by your interviewer or by using factors you can reasonably estimate about the market. You can then consider profit margins and what portion of the market the company must capture to break even.

Market attractiveness

The market a company is thinking about entering may be huge, but it can still be unattractive. Key questions include: What is the profit margin for companies already in the market?  What does the competition in the market look like? Large firms with huge marketing budgets or small companies? 

Costs of entry

Will new technology, equipment, sales staff, or something else be required to succeed in the new market? If so, what will it cost? The greater the investment required to enter a market, the more difficult it will be to recoup the initial investment.

Capabilities

Does the firm being discussed have what it takes to succeed in the new market? In some markets, the key to success is marketing expertise and distribution. In others, it’s low costs and disciplined business processes. Identify the key attributes of success in the market and whether the company possesses those attributes.

To learn how you can structure and break down a case such as these, visit the  Case Interview Frameworks  page can help you think through important factors in this type of consulting case interview question.

Above, we looked at how to analyze a market entry case. 

If a market is attractive but the client does not have all the capabilities required to succeed in it, it may decide to buy the right capabilities through a merger or acquisition (M&A). 

They could also consider M&A opportunities if they need to enter the market fast rather than build capabilities over time.

The number 3 competitor in the cellular phone services market is at a disadvantage relative to its larger competitors. Providing cellular phone service has high fixed costs—for the equipment that transmits calls, the retail stores that sell phones and provide in-person customer support, and the marketing spend that is key to customer attraction and retention. The CEO is considering acquiring a smaller competitor in order to gain market share. He would like our help thinking through this decision.

The president of a national drug-store chain is considering acquiring a large, national health insurance provider. The merger would combine one company’s network of pharmacies and pharmacy management business with the health insurance operations of the other, vertically integrating the companies. He would like our help analyzing the potential benefits to customers and shareholders.

When you get this type of case, ask your interviewer why the company is considering the merger or acquisition. They may provide key information on the size and attractiveness of the market the target company is in. Assuming the target company is in a large, attractive market and has the critical capabilities required to succeed in that market, then you should consider whether it is better to build the new business internally or undertake a merger or acquisition. 

If two companies are considering a merger, they still have to persuade their shareholders that the 2 companies would be more valuable working together than on their own. The value the companies can create by working together is called  synergy .

Synergies from a merger or acquisition can be on the cost side, the revenue side, or both. Cost synergies include leveraging fixed costs across more business or cutting costs duplicated in both firms’ operations. Revenue side synergies include selling a broader range of products through the existing sales force or distribution channel. 

The synergies created by the merger or acquisition must be greater than the premium that must be paid to secure the deal in order for the transaction to make sense.

Integration

Mergers and acquisitions are large and complicated transactions. They require  integrating  the talent, systems, policies, and processes of the 2 organizations. Synergies that look good on PowerPoint slides do not always accrue in real life. In addition, key employees may quit during the disruption and uncertainty the M&A activity causes. Even if substantial synergies are identified, a company should consider whether it can successfully undertake the integration.

Regulatory Approval

Lastly, mergers of large companies in regulated markets (financial services, telecommunications) and concentrated markets (ones with only a few large competitors) can require government approval . The possibility of the government blocking the merger or acquisition should be considered in this type of case.

Cost Optimization

A top-3 home improvement retailer has seen price increases from several of its vendors, squeezing its bottom line. The company wants to know how it can cut costs to restore its margins to their previous levels.

The head of an automobile manufacturer has seen its production costs rise over the last several years. She wants your help in turning around this trend.

The most important thing to understand when addressing this type of case is what is going on with fixed costs and variable costs . The costs can be broken down and compared to competitors’ costs or costs in prior years to identify opportunities for improvement.

As a reminder, here are the definitions of fixed and variable costs:

Fixed Costs

Costs that you incur just because you are in business regardless of how many units you sell. Examples: factory rent, equipment depreciation, compensation for salaried employees, and property taxes. A way to think about fixed costs is that a cost that does not change over the short-term, even if a business experiences increases or decreases in its sales volume.

Variable Costs

Costs that only incur when you begin to produce units (if you sell nothing you have no variable costs). Examples: sales commissions, credit card transaction costs, and sales taxes. A way to think about variable costs is that a cost that does change over the short-term. More sales volume will mean more variable costs.

Startup / Early-Stage Venture

Startup and early-stage venture cases have some similarities to market entry cases. 

Ensuring that the market the company is going after is big enough and has high enough margins to be attractive is important, as is understanding their competition. 

Startups are small, nimble companies with only a handful of key employees and limited access to cash. These factors need to be taken into account.

A student from Iceland studying in the U.S. has determined there’s a big opportunity to bring Icelandic-style yogurt to this market. How would you recommend he proceed?

A software company has developed video technology that can be used to quickly and easily create short videos that can be sent to a colleague in place of typing a long email. This disruptive technology will take advantage of the cameras built into cell phones and laptops as well as consumers’ preference for watching a video rather than reading text. The company has a small number of beta customers and is looking for advice on how to ramp up their product to attract a wider audience.

When answering this type of case, focus on the key things that help these small, fast-growth ventures move with agility as they search for the product and business model that will attract customers and investors. 

The Right People

They need the right people —ones with product savvy, marketing savvy and investor savvy to make it. 

A Minimum Viable Product

They need a minimum viable product . This is an initial version of their product offering that will attract paying customers, allowing them earn money and to collect feedback that can be used to improve the product. It will also serve as a proof-of-concept to investors. 

A Business Plan

Start-up and early stage venture also need an initial business plan addressing how they will bring their product to market.

Non-Profitability Cases

Some might focus on charitable organization. Others might focus on businesses issues that don’t relate directly to profits, such as employee retention or understanding the competitive dynamics in an industry. 

An overview of how to approach non-profitability cases is found on this page .

This section focuses on key concepts to address in a few common types of non-profitability cases.

Lives Affected

Government agencies and charitable organizations don’t aim to maximize profits. Nonetheless, they do important work that affects many lives. 

They might hire a consulting company to help them improve their effectiveness, or a consulting firm might take on an important project for a charitable organization on a pro-bono basis. 

The state agency that administers the free summer lunch program for children of families under a certain income threshold wants to increase the reach of its program. How would you advise they approach this? 

Malaria is a devastating disease, affecting hundreds of millions of individuals each year. It’s transferred to humans by mosquitoes, with most of the cases occurring in South Asia and Sub-Saharan Africa. Though drugs to treat the disease exist, many in the affected regions don’t have access to or can’t afford these drugs. The disease is a strain on the economies of several nations, perpetuating the cycle of poverty. What can be done to alleviate this disease and its adverse economic effects?

Key Performance Indicators (KPIs)

A detailed example of how to approach a lives affected case is provided  here .  As discussed in that case, the key to answering this type of question is to find the key performance indicator (KPI) the organization is trying to improve. In the case of the first sample question above, this is the number of free lunches served to needy children. 

Benchmarking

Once you’ve established the KPI, the case can be answered in the same way you’d answer any case question on business improvement. You can benchmark the organization’s performance by looking at trends in the KPI over time or comparing the growth of the organization’s KPI to that of other organizations serving the same target population to assess whether the agency is doing a good job meeting their mandate or falling behind. If they are falling behind, drill down into the factors that might be causing them to do so.

Cases focused on employee retention are not directly about profits, though the loss of key skills when employees depart and the cost of training new hires require hurts the profitability of organizations with high turnover. 

A fast-food chain is experiencing an increase in the already-high rate of employee turnover typical in its industry. It’s also experiencing trouble attracting qualified new employees. What would you suggest?

The school system in a middle-class suburban town is experiencing higher-than-normal rates of teacher attrition. With a tight budget, they are unable to simply raise salaries to hold onto experienced teachers. What options does the school system have for increasing teacher retention?

Conducting retention interviews —interviews with departing employees to find out why they’re leaving the organization—is a standard practice in most organizations. Because of this, there should be data available on what employees like about their jobs, don’t like about their jobs, why they looked for new opportunities and what new job they’re taking. Ask your interviewer for this information, as well as survey data on the job satisfaction of all employees. It can be used to develop a multi-pronged approach to improving employee retention.

• Look for opportunities to enhance aspects of the job that appeal to employees and change the negative aspects of working for the organization. For instance: What about the job is appealing? 
• Do employees see the work of the organization positively impacting the broader community? 
• Do employees like their colleagues, recognition they receive from management, the financial package provided? 

Industry Landscape and Competitive Dynamics

Cases focused on the landscape of an industry and its competitive dynamics are about the big-picture strategic issues that must be taken into account to compete effectively in that industry.

The traditional newspaper industry is facing heavy pressure from free online news organizations that don’t face the cost of printing a traditional newspaper and are able to leverage Internet ads as a source of revenue. The publisher of an award-winning regional paper would like your help in assessing and responding to this new threat.

The food and beverage industry faces disruption to their traditional brands as organic and small-batch products gain favor with consumers. How should companies in this industry respond to this new of competitive threat?

When analyzing this kind of case, first look for what is changing in the industry —consumer preferences, brand loyalty, barriers to entering the market, regulation, the industry’s cost structure, etc. Ensure you know what the source of change is before you begin to look for a strategy to help the client succeed in the new marketplace. 

For tips on structuring a case like these, visit the  Business Frameworks page . SWOT analysis and other frameworks include some factors to consider in this type of consulting case interview question.

Market Sizing Questions (Also Called Dinner Conversation Cases)

Market sizing cases are focused on establishing the size of a market in terms of annual revenue or the number of units sold rather than determining how to compete successfully in the market. 

Consulting firms often ask market sizing questions early in the consulting interview process or in interviews of undergraduate students who may not have a deep business background. 

They can also be one component of complicated, multi-step cases in later-round interviews. Market sizing questions focus on making logical estimates, showing creativity, and doing basic math.  

What is the size of the market for organic toothpaste in the United States?

How many golf balls would fit inside the Empire State building?

What Are Consulting Interviewers Looking for on Market Sizing Cases?

With case interview questions of this type, you’re not expected to know the answer, but instead to show a logical way of deducing it. Committing a few key facts to memory would serve you well. For example, knowing the population of the United States (or the country you live in) would give you a good place to start as you think through the size of the market for various retail goods. Gross domestic product can help with sizing industrial markets.

Key Statistics to Know for Market Sizing Case Questions:

The Population of the United States 2019 – 329 million according to the US Census Bureau .

World population in 2015 – 7.4 billion according to the United Nations DESA / Populations Division .

2018 Gross Domestic Product of the United States – $20.5 trillion according to the Bureau of Economic Analysis of the U.S. Department of Commerce .

Statistics like these give you a good foundation to start your market size analysis. For instance, you could begin estimating the size of the U.S. market for organic toothpaste with the US population. From there, make logical assumptions:

• How many times a day does the average American brushes their teeth?
• How many toothpaste applications are in the average tube of toothpaste?
• How much does the average tube of toothpaste cost?

These assumptions will allow you to calculate the size of the overall toothpaste market in terms of annual revenue. To get to the annual revenue of organic toothpaste you’ll also need to estimate:

• What portion of toothpaste consumers prefers organic toothpaste?

You can (and should) bring paper and a pen into consulting interviews. Use these to keep track of your assumptions as you work through them and to do the basic math required to come to a conclusion.

 Our Market Sizing Questions article has a list of the 7 steps to answering this type of question.

Key Things to Remember When Answering a Market Sizing Question:

• Ask clarifying questions. Does the interviewer want the market size in terms of dollars or units? For the United States, North America, the world?
• Use round numbers for simplicity. For instance, using $20 trillion for U.S. GDP rather than $20.5 would be fine.
• Creativity in your approach to approximating the market is important, but so is good sense. Don’t be so creative that your answer lacks credibility.
• Practice case math so you can do it quickly and correctly even under the stress of an interview.
• Give your answer a sniff-test at the end. Does it make sense? This will both show that you are careful in your analysis and give you the chance to fix an arithmetic mistake if you find you’re way off. 

Case Interview Math (also known as consulting math)

Management consulting interviewers screen candidates to ensure that they can do basic math. 

Don’t worry if you didn’t ace multivariate calculus, the math is usually basic arithmetic—addition, subtraction, multiplication, division and fractions/percentages. You may also be asked to extract data from charts and convert from one unit of measure to another.

As mentioned in the discussion of market-sizing case questions above, you can and should bring a paper and pen into the interview. It’s fine to write out your calculations.

Consulting Math Example

In each step, we’ll provide a sense of how we are making the estimate so that the interviewer knows we’re not just grabbing a number out of the air. We want our answer to be as grounded in fact as possible. 

The population of the United States: 329 million. We’ll round to 330 million for simplicity.

The number of times the average American brushes their teeth – 2 times per day. Some people brush at lunchtime too, but that’s probably offset by people who only brush once a day.

330 million people brushing 2x’s per day gives us 660 million toothpaste applications/day.

To get to an annual number of toothpaste applications, we need to multiply by 365. That’s 241 billion toothpaste applications. We’ll round to 240 billion for simplicity.

A tube of toothpaste usually lasts me about 2 months. That means we need to divide by 120 toothpaste applications per tube to come up with the number of tubes sold annually (2 months x 30 days/month x 2 applications/day). 240 billion toothpaste applications / 120 applications per tube = 2 billion tubes of toothpaste sold in the U.S. every year.

The cost of toothpaste ranges from $1 for inexpensive brands to $4 for expensive brands, but the average cost is probably about $2. This means the total revenue for toothpaste sold in the U.S. is 2 billion tubes x $2 or $4 billion.

The percent of the toothpaste market that’s organic is a little tricky to estimate. In the grocery store I shop in, there’s 1 aisle of organic goods in a store that has 20 aisles – that means organic products make up 5% of shelf space (and presumably also of sales). 

I think that people would be less likely to buy organic toothpaste than organic food, because you eat organic food, but you spit organic toothpaste out into the sink. Organic products always cost more and organic toothpaste doesn’t seem quite as important to your health. 

Conclusion: Based on that, I’ll say that 1% of the market for toothpaste is organic, so if $4 billion in toothpaste is sold in the U.S. every year, $40 million of it is organic toothpaste.

Is our answer right? 

Probably not exactly. There are different sizes of toothpaste tubes, a complication that we did not consider in this analysis. There might be some people who don’t brush their teeth every day. That would mean that we overestimated consumption. 

But our estimate of the market size for organic toothpaste is reasonable and grounded in logical assumptions. We could sniff-test our answer by comparing it to a market size we know, or to GDP, one of the facts we suggested having in your back pocket for market sizing case questions. 

U.S. GDP was about $20 trillion in 2018. Our estimations suggest that the overall toothpaste market is $4 billion. That means toothpaste is 1/5,000 of the U.S. economy, and the market for organic toothpaste is 1% of that. 

That sounds plausible. If your answer showed that the market for organic toothpaste was larger than U.S. GDP, it would be a clear indication that you made a mistake somewhere along the way.

For the 4 types of math problems you’ll be asked to compute as part of case studies, read Case Interview Math.

Above, we’ve provided you with 11 different types of case interview questions you might be asked during your consulting interviews. We’ve also told you that you need to get great at doing case math. 

Overwhelming? It can be.

But it doesn’t have to be.

The best way to prepare for your consulting case interviews is NOT to spend hundreds of hours reading every case study question and answer you can get your hands on. Instead, see our page on Case Interview Practice  to find out how to make the most of your interview prep time. In addition, check out this video where Davis Nguyen, Founder of My Consulting Offer, talks about how mastering the case interview is made easier when you focus on the most common types of cases. 

Here in an online workshop he conducted for  Columbia University, NYU, and Cornell students, you can see why this approach is so effective:

After studying the information on this page, you have an in-depth understanding of the types of cases you could be asked to analyze in consulting interviews. From Davis’s video, you know why this is so important to focus on the main types of cases. You’re well prepared to find a case study practice partner and begin practicing.

As you prepare for case interviews, you should use this page in conjunction with  Case Interview Examples , where you’ll find links to sample case study questions and their answers. Remember that while it is important to discuss all the appropriate aspects of a business case, it’s important to structure your analysis and your answer. Refer back to our page on  Case Interview Frameworks   to ensure that you’re not just practicing more cases, but doing them better.

If you still have questions, leave them in the comments below. We’ll ask our My Consulting Offer coaches and get back to you with answers.

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Seasonal contributions and influencing factors of urban carbon emission intensity: a case study of tianjin, china, 1. introduction, 2. the literature review, 3. methods and data, 3.1. the research methodology, 3.1.1. calculation of carbon emission intensity, 3.1.2. the decomposition of influencing factors, 3.2. the data sources, 4. results and discussion, 4.1. an annual analysis of carbon emission intensity, 4.2. a quarterly analysis of carbon emission intensity, 4.3. a decomposition analysis of the factors affecting quarterly carbon emission intensity changes, 4.3.1. a decomposition analysis of the factors influencing quarterly carbon emission intensity changes over the years 2012–2022, 4.3.2. intra-annual quarterly changes and a decomposition analysis of the carbon emission intensity factors, 2012–2022, 5. conclusions and recommendations, 5.1. conclusions, 5.2. recommendations, supplementary materials, author contributions, institutional review board statement, informed consent statement, data availability statement, conflicts of interest.

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Xiang, T.; Bian, J.; Li, Y.; Gu, Y.; Wang, Y.; Zhang, Y.; Wang, J. Seasonal Contributions and Influencing Factors of Urban Carbon Emission Intensity: A Case Study of Tianjin, China. Atmosphere 2024 , 15 , 947. https://doi.org/10.3390/atmos15080947

Xiang T, Bian J, Li Y, Gu Y, Wang Y, Zhang Y, Wang J. Seasonal Contributions and Influencing Factors of Urban Carbon Emission Intensity: A Case Study of Tianjin, China. Atmosphere . 2024; 15(8):947. https://doi.org/10.3390/atmos15080947

Xiang, Tianchun, Jiang Bian, Yumeng Li, Yiming Gu, Yang Wang, Yahui Zhang, and Junfeng Wang. 2024. "Seasonal Contributions and Influencing Factors of Urban Carbon Emission Intensity: A Case Study of Tianjin, China" Atmosphere 15, no. 8: 947. https://doi.org/10.3390/atmos15080947

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