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Company case by E.ON Inhouse Consulting
Climate change has become one of the biggest challenges in the 21st century, and with roughly 75% of all CO₂ emissions coming from energy, this sector plays a key role in the transition to a reduced carbon footprint. E.ON has taken up on the challenge to promote more sustainable and efficient energy ... Climate change has become one of the biggest challenges in the 21st century, and with roughly 75% of all CO₂ emissions coming from energy, this sector plays a key role in the transition to a ... (Open whole case)
5.9k
Times solved
3.8
< 100 Ratings
Intermediate
Difficulty
Company case by RWE Consulting
RWE is an international renewables company with a proud heritage of more than 125 years in the energy business. Recently, during the Capital Markets Day in 2023, RWE’s CEO renewed the company’s 2030 vision of being a global leader in green energy. To achieve this, additional substantial investments ... RWE is an international renewables company with a proud heritage of more than 125 years in the energy business. Recently, during the Capital Markets Day in 2023, RWE’s CEO renewed the compan ... (Open whole case)
17.2k
Times solved
5.0
< 100 Ratings
Intermediate
Difficulty
Company case by Bain & Company
You have inherited the “Old Winery” from your grandfather, a winery that has been family-owned for five generations and can be dated back to the 16th century.Half of the eleven hectares are used to grow white grapes, the other half to grow red grapes. They are grown in a conventional way, i.e. they ... You have inherited the “Old Winery” from your grandfather, a winery that has been family-owned for five generations and can be dated back to the 16th century.Half of the eleven hectares are ... (Open whole case)
119.5k
Times solved
4.3
2.0k Ratings
Intermediate
Difficulty
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Company case by Oliver Wyman
Your client, large automotive OEM WyCar, has developed its first fully electric vehicle (EV) and introduced it as a pilot on the Austrian market last year. However, sales have been far below the expected numbers. The management has engaged you to support them in understanding the reasons and advise ... Your client, large automotive OEM WyCar, has developed its first fully electric vehicle (EV) and introduced it as a pilot on the Austrian market last year. However, sales have been far below ... (Open whole case)
122.1k
Times solved
4.4
6.6k Ratings
Intermediate
Difficulty
Expert case by Dennis
Salty Boy Inc. is an underground salt mine in Texas whose new leadership are supporters of the circular economy. Circular economy provides a pathway towards more sustainable production and consumption patterns – CE introduces circularity to many areas of production cycles and encourages using renewa ... Salty Boy Inc. is an underground salt mine in Texas whose new leadership are supporters of the circular economy. Circular economy provides a pathway towards more sustainable production and c ... (Open whole case)
< 100
Times solved
0.0
< 100 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)
200+
Times solved
1.0
< 100 Ratings
Beginner
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)
1.2k
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)
800+
Times solved
3.0
< 100 Ratings
Advanced
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)
1.0k
Times solved
3.0
< 100 Ratings
Beginner
Difficulty
Expert case by
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)
1.0k
Times solved
5.0
< 100 Ratings
Beginner
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)
2.1k
Times solved
5.0
< 100 Ratings
Advanced
Difficulty
Expert case by Cristian
Our client, Soy Technologies specializes in soy production and processing.The client harvests their soybean crops and processes the soybeans to extract the protein and create soybean meals that are later used for animal feed.Since the demand for soy protein has been steadily increasing in recent yea ... Our client, Soy Technologies specializes in soy production and processing.The client harvests their soybean crops and processes the soybeans to extract the protein and create soybean meals t ... (Open whole case)
6.9k
Times solved
4.4
< 100 Ratings
Advanced
Difficulty
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Expert case by Cristian
Our client, Element Mobile (EM), is the largest German telecommunications provider, with an impressive supply chain comprised of dozens of suppliers, six distribution centres, and hundreds of stores. EM offers a variety of products to its 20 million customers, including sim cards, broadband, phones, ... Our client, Element Mobile (EM), is the largest German telecommunications provider, with an impressive supply chain comprised of dozens of suppliers, six distribution centres, and hundreds o ... (Open whole case)
6.0k
Times solved
4.6
< 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)
5.1k
Times solved
3.6
< 100 Ratings
Intermediate
Difficulty
Expert case by Rushabh
The Government of Spain has tasked the City of Barcelona to increase their revenue generated from the City.Thus, in order to generate more revenue, the Local Government of Barcelona has engaged our firm to examine the viability of passing a new law imposing a fine on jaywalking violations.How should ... The Government of Spain has tasked the City of Barcelona to increase their revenue generated from the City.Thus, in order to generate more revenue, the Local Government of Barcelona has enga ... (Open whole case)
1.2k
Times solved
4.0
< 100 Ratings
Advanced
Difficulty
Expert case by Francesco
Our client is an Italian multinational manufacturer of branded chocolate and confectionery products. One of their most popular products is Hazella, a hazelnut spread.Despite its worldwide popularity, Hazella is considered to be high in calories by some customers. For this reason, our client has deve ... Our client is an Italian multinational manufacturer of branded chocolate and confectionery products. One of their most popular products is Hazella, a hazelnut spread.Despite its worldwide po ... (Open whole case)
4.8k
Times solved
5.0
< 100 Ratings
Advanced
Difficulty
Expert case by Francesco
Our client is the US-based biotech company Top Chemicals. They have just developed a fertilizer that is waiting to get approval for commercialization. They hired us to identify the best price for it. Our client is the US-based biotech company Top Chemicals. They have just developed a fertilizer that is waiting to get approval for commercialization. They hired us to identify the best price for it. (Open whole case)
2.5k
Times solved
4.3
< 100 Ratings
Intermediate
Difficulty
Expert case by Cristian
Let’s assume our client is Poliglot, a popular language app. Poliglot is five years old, originally from the US, but available worldwide. The app currently offers the possibility of learning over twenty languages for free, with extra benefits (e.g., no ads, additional exercises) available to premium ... Let’s assume our client is Poliglot, a popular language app. Poliglot is five years old, originally from the US, but available worldwide. The app currently offers the possibility of learning ... (Open whole case)
3.0k
Times solved
4.6
< 100 Ratings
Intermediate
Difficulty
Expert case by Clara
Your client is  the CEO of a coffin manufacturing company based in Geneva, Switzerland (Europe). The company has existed with little changes to the business model for three generations, manufacturing high-quality, hand-crafted coffins, with a highly skilled and specialized labor force ... Your client is  the CEO of a coffin manufacturing company based in Geneva, Switzerland (Europe). The company has existed with little changes to the business model for three ge ... (Open whole case)
2.2k
Times solved
4.5
< 100 Ratings
Advanced
Difficulty
Expert case by Antonello
A wealthy client has recently bought an island in the Caribbean. She has engaged us to identify possible uses for her new island. A wealthy client has recently bought an island in the Caribbean. She has engaged us to identify possible uses for her new island. (Open whole case)
16.4k
Times solved
4.6
300+ Ratings
Intermediate
Difficulty
1 - 20 of 51 results

Any Open Questions Left? Check Out Our FAQ

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.

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.

A Vast Selection of Management Consulting Cases

Our selection of case studies mirror the wide variety in real case interviews. Thus, you can solve challenging problems around market sizing, market-entry, pricing, or operations strategy. Moreover, all provided cases are marked with a level of difficulty and the respective case style. This will allow you to filter for interviewer-led (as used by McKinsey) and candidate-led cases. In addition, some of our corporate partners granted some great original cases that have been used in real interviews. Check them out to get some authentic insights about the real application process of top firms like Bain, Roland Berger, and many more. These cases are clearly indicated by the firm's logo.
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