Practice Case Interviews - Browse Our Extensive Case Library

Invite other candidates for a meeting to crack the case interactively or solve it on your own. If you like to check your case approach just have a look at the given sample solution. (Read more)
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Company case by Deloitte
Duraflex is a German footwear company with annual men’s footwear sales of approximately €1 b.They have always relied on the boot market for the majority of their volume. In this market they compete with three other major competitors.In the fall of 2019, Badger – one of Duraflex’s competitiors – laun ... Duraflex is a German footwear company with annual men’s footwear sales of approximately €1 b.They have always relied on the boot market for the majority of their volume. In this market they ... (Open whole case)
88.6k
Times solved
4.4
13.2k Ratings
Intermediate
Difficulty
Expert case by Dennis
A large natural gas field is unexpectedly discovered on the Mediterranean island of Corsica. The gas can be accessed and produced relatively easily and is of good quality. Europe, and especially Germany as the largest gas consumer in the EU, is looking for alternative gas suppliers to reduce its one ... A large natural gas field is unexpectedly discovered on the Mediterranean island of Corsica. The gas can be accessed and produced relatively easily and is of good quality. Europe, and especi ... (Open whole case)
< 100
Times solved
0.0
< 100 Ratings
Beginner
Difficulty
Expert case by Francesco
Our client is a large American music company with a 40% market share and $20 billion in revenue. During the last holiday season, the client released fewer new tracks onto music streaming services compared to the year before. We would like you to figure out what could be causing t ... Our client is a large American music company with a 40% market share and $20 billion in revenue. During the last holiday season, the client released fewer new tracks onto musi ... (Open whole case)
5.5k
Times solved
5.0
< 100 Ratings
Intermediate
Difficulty

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Expert case by Francesco
Our client today is AirService – a service provider for a number of airlines and airports. Their management recently realized a decrease in profits that is linked to increasing costs.Accordingly, they have engaged our firm to help address this issue. How would you approach this problem? Our client today is AirService – a service provider for a number of airlines and airports. Their management recently realized a decrease in profits that is linked to increasing costs.Accordingly, they have engaged our firm to help address this issue. How would you approach this problem? (Open whole case)
7.0k
Times solved
5.0
< 100 Ratings
Intermediate
Difficulty
Expert case by Dennis
Your client is Alistair, a brew master from the east coast of the United States. He has developed a beer recipe he believes will revolutionize the beer drinking experience in the US. Alistair was able to convince his family and friends to invest in his business idea after letting them taste a sample ... Your client is Alistair, a brew master from the east coast of the United States. He has developed a beer recipe he believes will revolutionize the beer drinking experience in the US. Alistai ... (Open whole case)
100+
Times solved
0.0
< 100 Ratings
Beginner
Difficulty
Expert case by Alberto
Our client is Sierra Springs, a top 3 spring water producer in the U.S. The company owns the entire bottled-water production supply chain, including water sourcing, production of water-based products, bottling and packaging and distribution to retail outlets. Sierra Springs also leads its own brand ... Our client is Sierra Springs, a top 3 spring water producer in the U.S. The company owns the entire bottled-water production supply chain, including water sourcing, production of water-based ... (Open whole case)
400+
Times solved
5.0
< 100 Ratings
Intermediate
Difficulty
Expert case by Moritz
CLIENT OBJECTIVEOur client is Convenio, a US based company that operates a number of micro convenience stores and vending machines throughout the country. Convenio is considering the launch of a new product to enable convenience in passenger transportation and is seeking McKinsey’s help to determine ... CLIENT OBJECTIVEOur client is Convenio, a US based company that operates a number of micro convenience stores and vending machines throughout the country. Convenio is considering the launch ... (Open whole case)
500+
Times solved
4.0
< 100 Ratings
Intermediate
Difficulty
Expert case by Ian
Estimate the daily revenue of your nearest coffee shop.Clarifying information:You can pick any coffee shop of your choiceWe would like a “typical” day (i.e. weekday)All revenue (all purchases) Estimate the daily revenue of your nearest coffee shop.Clarifying information:You can pick any coffee shop of your choiceWe would like a “typical” day (i.e. weekday)All revenue (all purchases) (Open whole case)
900+
Times solved
4.0
< 100 Ratings
Intermediate
Difficulty
Expert case by Ian
Estimate the number of people on the internet at this exact moment in time.Clarifying information:We can assume it is 11am ESTIt is a weekdayOn the internet means on their computer or their phone====================NOTE==========================Please make sure to check the video URL solution to get ... Estimate the number of people on the internet at this exact moment in time.Clarifying information:We can assume it is 11am ESTIt is a weekdayOn the internet means on their computer or their ... (Open whole case)
500+
Times solved
3.0
< 100 Ratings
Advanced
Difficulty
Expert case by Ben
Your client is the Knight’s Watch Municipality. Their governor, John Snow, has engaged you, explaining that an evil army composed of White Walkers plans to destroy all of Westeros. He tells you that the Northern Kingdom is the only fortress capable of stopping this force. However, the wall is s ... Your client is the Knight’s Watch Municipality. Their governor, John Snow, has engaged you, explaining that an evil army composed of White Walkers plans to destroy all of Westeros. He tells ... (Open whole case)
100+
Times solved
0.0
< 100 Ratings
Intermediate
Difficulty
Expert case by Ben
Pedal Pals is an interactive fitness platform with millions of members, offering connected, technology-enabled fitness classes that utilize its proprietary hardware, the Pedal Pal stationary bicycle. Pedal Pals generates strong recurring revenue from its members, who pay subscription fees to access ... Pedal Pals is an interactive fitness platform with millions of members, offering connected, technology-enabled fitness classes that utilize its proprietary hardware, the Pedal Pal stationary ... (Open whole case)
100+
Times solved
0.0
< 100 Ratings
Intermediate
Difficulty
Expert case by Ben
Your client is Hogwarts University. Their President, Dr. Albus Dumbledore, is concerned with the university’s profitability and needs your help in determining the best course of action. Your client is Hogwarts University. Their President, Dr. Albus Dumbledore, is concerned with the university’s profitability and needs your help in determining the best course of action. (Open whole case)
100+
Times solved
0.0
< 100 Ratings
Intermediate
Difficulty
Expert case by Ian
An entrepreneur has come to you looking to disrupt the taxi industry in NYC. They are interested in determining the number of taxis in Manhattan, in order to understand how large their fleet would need to be to compete. How would you go about determining how many taxis exist in Manhattan?If the cand ... An entrepreneur has come to you looking to disrupt the taxi industry in NYC. They are interested in determining the number of taxis in Manhattan, in order to understand how large their fleet ... (Open whole case)
600+
Times solved
3.0
< 100 Ratings
Beginner
Difficulty
Expert case by Agrim
Our client is a pharmacy in Dubai - called NewWave Pharmacy. This pharmacy wants to start a new & unique delivery service and want to understand if it is a good idea or not? If yes, then how should they price it? And how should they start it? Our client is a pharmacy in Dubai - called NewWave Pharmacy. This pharmacy wants to start a new & unique delivery service and want to understand if it is a good idea or not? If yes, then how should they price it? And how should they start it? (Open whole case)
600+
Times solved
0.0
< 100 Ratings
Advanced
Difficulty
Expert case by Antonio
Your client, a private equity fund, is considering entry into the wine business through the acquisition of a vineyard called “Piumarolo” in Italy's renowned Piedmont region. Since this marks the fund's initial foray into this specific sector, they have engaged our team to conduct a preliminary marke ... Your client, a private equity fund, is considering entry into the wine business through the acquisition of a vineyard called “Piumarolo” in Italy's renowned Piedmont region. Since this marks ... (Open whole case)
700+
Times solved
5.0
< 100 Ratings
Beginner
Difficulty
Expert case by Ian
Note: If you have not already done so, first work through the 1st part of this case: https://www.preplounge.com/en/management-consulting-cases/candidate-led-usual-style/intermediate/mbb-climate-change-operations-285This case is designed to show you how a case can evolve/change based on new informati ... Note: If you have not already done so, first work through the 1st part of this case: https://www.preplounge.com/en/management-consulting-cases/candidate-led-usual-style/intermediate/mbb-clim ... (Open whole case)
400+
Times solved
5.0
< 100 Ratings
Intermediate
Difficulty
Expert case by Ian
Our client, Vets2U, a well-established organization that runs ten Mobile Veterinary Clinics (MVC) in the US, has witnessed a concerning trend of stagnant revenues of $100M over the past few years. In light of this issue, the CEO of Vets2U has brought us in with the goal of increasing revenues by 25% ... Our client, Vets2U, a well-established organization that runs ten Mobile Veterinary Clinics (MVC) in the US, has witnessed a concerning trend of stagnant revenues of $100M over the past few ... (Open whole case)
1.2k
Times solved
4.6
< 100 Ratings
Intermediate
Difficulty
Expert case by Ian
A startup company specializing in last mile delivery with drones is determined to reach $20M in revenue while also becoming profitable. The company's innovation lies in leveraging drone technology to revolutionize the logistics sector, specifically focusing on last-mile delivery, which accounts for ... A startup company specializing in last mile delivery with drones is determined to reach $20M in revenue while also becoming profitable. The company's innovation lies in leveraging drone tech ... (Open whole case)
1.7k
Times solved
5.0
< 100 Ratings
Advanced
Difficulty
Expert case by Ian
[PLEASE NOTE: This is a technically difficult case and should only be completed by those coming in as a Technology specialist, i.e. recruiting for McKinsey Digital, BCG Platinion, etc.]Our client is a multinational oil and gas company. While they are vertically integrated and have upstream, midstrea ... [PLEASE NOTE: This is a technically difficult case and should only be completed by those coming in as a Technology specialist, i.e. recruiting for McKinsey Digital, BCG Platinion, etc.]Our c ... (Open whole case)
13.5k
Times solved
4.4
< 100 Ratings
Advanced
Difficulty
Expert case by Ian
Our client is Korean Car Parts (KCP), a multi-national original equipment manufacturer (OEM) of car parts based in Korea. They've recently seen a decline in profits and have brought us in to understand how to address this falling profitability.==================================== ... Our client is Korean Car Parts (KCP), a multi-national original equipment manufacturer (OEM) of car parts based in Korea. They've recently seen a decline in profits and have b ... (Open whole case)
5.4k
Times solved
4.3
< 100 Ratings
Beginner
Difficulty
21 - 40 of 218 results

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What are cases?

Cases, also known as case studies, are business problems that a candidate is presented with during a case interview at a management consultancy. The challenge is to solve it under pressure and in a structured way.

Why are consulting cases so important for your preparation?

Consulting interviews are among the most competitive and difficult job interviews that exist. Interviewers use cases as an indicator to test whether you have what it takes to become a successful consultant. In order to pass, you need to ace the case interview part. And in order to ace the case interview part, you need to be well-prepared. Thus, practicing cases is one of the most important aspects of interview preparation in consulting. During different rounds of interviews you will have to solve cases again and again to prove your structured and analytical thinking as well as your communication skills.

How can I practice cases?

You can practice cases on your own and go through them to get a first feeling for the structure. Afterwards, you should go into a real interview environment and practice cases with other members on the platform. You will find more than 50 mock-interview requests on the Meeting Board every day, which you can easily accept. If there is nothing suitable on the Meeting Board, you can also use the Candidate Listing. Here you can find active members on the platform and send them a direct meeting request. If you want to take your case practice to the next level, we recommend you to schedule coaching sessions with our coaches who have many years of experience in helping candidates receive their dream job offer.

What is the difference between Candidate-led and Interviewer-led?

In an interviewer-led case interview, the interviewer leads through the conversation. This means that the interviewer asks specific questions and also controls the time you have to analyze and answer different questions and therefore the depth of your analysis. In contrast, the candidate-led style (which is more common) is about you taking the initiative as a candidate. The initial problem is given to you by your interviewer. Afterwards, you have the freedom to structure the case according to your ideas and to ask questions proactively in order to find a solution to the problem.

What are real cases?

Real cases in the PrepLounge Case Library are cases that were submitted by management consultancies and have been treated as such within the company. They were made available from the real interview process. In this way, you can gain deep insights into the requirements of the case interview with the respective top consultancies (e.g. Bain & Company, Roland Berger, Deloitte, Oliver Wyman). We have marked these cases with the corresponding company logo.

What are expert cases?

Expert cases were created by our PrepLounge coaches and either contain real problems that the experts have already dealt with in their lives as consultants or cases from actual consulting interviews they took part in. They offer you an optimal preparation through the different subjects, levels of difficulty and styles. And the best thing is: If you have questions about the cases, you can ask them directly to the authors.

What are video case solutions?

Video case solutions are cases in which we provide you with a solution that includes a YouTube video. With this we want to help you to understand case solutions even better.

What does the rating of the cases mean?

Every member has the possibility to rate a case and leave feedback on the case. This gives you the opportunity to call up a ranking and solve the cases that are particularly popular in the community. It also gives us the opportunity to continuously improve our cases in order to provide you with the best possible practice material.

Which are the most interesting cases on PrepLounge?

Which cases are most interesting for you depends on your personal preference and your level of knowledge. If you are just starting with the case interview preparation, beginner cases are probably the most interesting ones for you. You also have the possibility to filter by different categories, such as personal fit, market analysis or brain teaser and many more, in order to address exactly the topics that are most relevant for your application.
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