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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)
5.8k
Times solved
3.8
< 100 Ratings
Intermediate
Difficulty
Company case by Whiteshield Advisory
This case is representative of the type of problems that a client might engage Whiteshield to help them with. Before asking you any questions about the case, I will give you the background that you will need. There are several issues that I would like to cover with you today; please do not be surpri ... This case is representative of the type of problems that a client might engage Whiteshield to help them with. Before asking you any questions about the case, I will give you the background t ... (Open whole case)
3.4k
Times solved
4.5
< 100 Ratings
Intermediate
Difficulty
Your client is a holding company that has three larger companies in its portfolio. The successful portfolio has developed very dynamically over the last two years and the companies are facing different challenges. The management takes this situation as an opportunity and wants to carry out a portfol ... Your client is a holding company that has three larger companies in its portfolio. The successful portfolio has developed very dynamically over the last two years and the companies are facin ... (Open whole case)
4.2k
Times solved
4.4
< 100 Ratings
Intermediate
Difficulty
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Company case by E.ON Inhouse Consulting
The European Union pursues the target of lowering the CO₂ emissions of their residents. Therefore, the EU introduced a CO₂ tax to create incentives for consumers to switch to more climate friendly alternatives and stabilize carbon dioxide emissions. Accordingly, and as E.ON’s strategy focuses o ... The European Union pursues the target of lowering the CO₂ emissions of their residents. Therefore, the EU introduced a CO₂ tax to create incentives for consumers to switch to more climate fr ... (Open whole case)
2.1k
Times solved
4.5
< 100 Ratings
Intermediate
Difficulty
As one of three management consultants with many years of experience, you have SET yourself the goal of founding your own management consultancy. The topics, contents and solution offering with which you can advise and support potential customers are clear. The legal company is already founded and r ... As one of three management consultants with many years of experience, you have SET yourself the goal of founding your own management consultancy. The topics, contents and solution offering w ... (Open whole case)
6.0k
Times solved
3.3
< 100 Ratings
Beginner
Difficulty
Your client tk Commodity Trade (tk ComT) is a global materials trader - they buy and sell raw materials. tk ComT had stable EBITDA margins in recent years. They consider expanding their target market and entering the Lithium (electric vehicle battery grade) trade, due to the current high demand for ... Your client tk Commodity Trade (tk ComT) is a global materials trader - they buy and sell raw materials. tk ComT had stable EBITDA margins in recent years. They consider expanding their targ ... (Open whole case)
13.3k
Times solved
4.0
< 100 Ratings
Advanced
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
As a consultant at Mercedes-Benz Management Consulting, you are actively shaping the future of mobility. While you are contributing to decisive projects that design the future of the world’s No.1 premium carmaker, you also develop your own career path and you have the unique possibility to build you ... As a consultant at Mercedes-Benz Management Consulting, you are actively shaping the future of mobility. While you are contributing to decisive projects that design the future of the world’s ... (Open whole case)
18.6k
Times solved
3.8
100+ Ratings
Intermediate
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)
600+
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)
800+
Times solved
4.3
< 100 Ratings
Intermediate
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
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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)
14.2k
Times solved
4.4
< 100 Ratings
Advanced
Difficulty
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 Cristian
Assume our client is CodeWave, a large software development firm headquartered in Silicon Valley. The company has a solid reputation in the tech industry and has been in operation for over 15 years. Codewave currently employs approximately 3,000 people and has rapidly expanded in recent years.  ... Assume our client is CodeWave, a large software development firm headquartered in Silicon Valley. The company has a solid reputation in the tech industry and has been in operation for over 1 ... (Open whole case)
1.2k
Times solved
5.0
< 100 Ratings
Intermediate
Difficulty
Expert case by Frederic
Our client is TrendWardrobe (TW), a clothing retailer in the US. It offers a wide range of fashionable clothing and accessories for men, women, and children. TW operates 200 stores across the top 50 cities in the US. These stores are typically spacious and situated in suburban areas. Additionally, T ... Our client is TrendWardrobe (TW), a clothing retailer in the US. It offers a wide range of fashionable clothing and accessories for men, women, and children. TW operates 200 stores across th ... (Open whole case)
800+
Times solved
5.0
< 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)
5.1k
Times solved
3.6
< 100 Ratings
Intermediate
Difficulty
Expert case by Cristian
Our client is Green Life, a digital challenger bank based in Europe. The bank operates solely online and offers its clients a variety of current accounts, insurance, and financial products. Green Life currently operates in 10 different EU countries and employs approximately 500 people. Due to i ... Our client is Green Life, a digital challenger bank based in Europe. The bank operates solely online and offers its clients a variety of current accounts, insurance, and financial products. ... (Open whole case)
1.5k
Times solved
4.5
< 100 Ratings
Advanced
Difficulty
Expert case by Cristian
Style Scape is a mid-sized retailer that sells clothing, accessories, and home goods through its physical stores and online platform. The business has been around for over a decade and has seen consistent growth in sales in its home market of the United States. Style Scape operates 30 stores nationw ... Style Scape is a mid-sized retailer that sells clothing, accessories, and home goods through its physical stores and online platform. The business has been around for over a decade and has s ... (Open whole case)
800+
Times solved
0.0
< 100 Ratings
Advanced
Difficulty
Expert case by Ian
Your client is a leading pharmaceutical company that is facing challenges with increasing pipeline costs and longer development timelines for their drug candidates. The company has multiple drug candidates in various stages of development and are looking for innovative strategies to streamline their ... Your client is a leading pharmaceutical company that is facing challenges with increasing pipeline costs and longer development timelines for their drug candidates. The company has multiple ... (Open whole case)
1.3k
Times solved
2.4
< 100 Ratings
Intermediate
Difficulty
1 - 20 of 88 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.

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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