What kind of case studies I can expect at ZS case interview, can anybody provide me with sample ones?

The product life cycle is a way to map the common stages a product undergoes throughout its lifespan. The product life cycle is typically divided into 5 different stages, each having specific strategic decisions affecting profits and revenues: Four Stages of the Product-Life-Cycle(1) Development: In the development phase, the product has just been finished and the most important facts and figures have been determined. As no profits are made here, this phase is not shown in the curve diagram.(2) Introduction: In the first phase, the product is introduced. Normally, at this stage, there are a few competitors and customers. Therefore, sales and profit are low and the risk that the product will not succeed is high. In order to boost sales, the focus lies heavily on promotion activities.(3) Growth: Products that succeed in addressing customer’s needs will lead to an increase in sales. Advertisement is still a key component to promote further growth.(4) Maturity: At this stage, the product can be seen as well established and widely accepted within the targeted customer group. Profits are high and risks are low. Typically, in this phase, competition increases. To keep the market position and expand this phase, companies often employ strategies such as the introduction of complementary or updated products or simply invest in marketing activities.(5) Decline: At this point, the product may not fulfill the current needs of the customers, and sales start to decline. The important decision at this stage is deciding when to take the product off market, such that the client optimizes financial gains and minimizes losses due to time and investment. Meaning of the Product-Life-Cycle in Case InterviewsThe product life cycle is a key concept in case interviews, especially when dealing with market entry, competitive strategy, or growth opportunities. Candidates should be familiar with the different stages and be able to derive strategic decisions accordingly.A common case question might be: "A company is planning to launch a new product. What factors should be analyzed to maximize success in the introduction phase?" A structured approach should consider aspects such as market demand, competitive landscape, pricing strategy, and marketing efforts. Similarly, cases related to the maturity or decline phase could focus on whether a product should be further developed or phased out. 

The case interview is one of the most challenging parts of the application process for consulting jobs. But why do companies prefer this method over traditional interviews? The answer lies in the many benefits case interviews offer — not just for you as a candidate, but also for the companies themselves. Let’s first explore why case interviews can be valuable for you before taking a look at the perspective of consulting firms. The Benefits of Case Interviews for You as a CandidateA case interview is very different from traditional job interviews because it simulates real challenges from the day-to-day life of a consultant. It gives you direct insight into typical problems and the ways of thinking and working in consulting. At the same time, it helps you identify your strengths and weaknesses while showing how you handle stressful situations. You’ll get the chance to test your resilience, decision-making skills, and analytical thinking — all essential qualities, not just in consulting.Additionally, a case interview allows you to gain hands-on experience. You’ll learn to work efficiently under pressure, use resources effectively, and develop innovative solutions for complex problems. Even if you don’t pass the interview, you’ll often receive valuable feedback to help you prepare for future opportunities. In group case interviews, you also get to showcase your teamwork skills — an important factor for your success in consulting. How Companies Benefit from Case InterviewsCase interviews also offer a range of advantages for companies. They allow employers to assess candidates in realistic scenarios and pinpoint the skills that are crucial for the job. By using practical challenges, companies can thoroughly evaluate a candidate's suitability and ensure they meet the demands of day-to-day consulting work.Moreover, case interviews are an efficient and standardized method that makes the selection process more objective and streamlined. They enable companies to test the specific skills needed in consulting, helping them identify the most qualified candidates. At the same time, these demanding interviews enhance employer branding by showcasing the company as an attractive and professional workplace. They also provide candidates with valuable insights into the company’s work environment, potential projects, and industry focus areas. What Skills Are Tested in Case Interviews?In case interviews, consulting firms want to ensure you have the key skills needed for a successful career in consulting. These include:Problem-Solving Skills: How do you approach complex challenges?Analytical Thinking: Can you critically assess information and draw logical conclusions?Structured Thinking: Are your arguments clear, logical, and goal-oriented?Quantitative Skills: How comfortable are you with numbers and data and can you perform quantitative analyses?Communication Skills: Can you present your solutions clearly and persuasively?Creativity: Do you come up with innovative approaches to tackle unusual problems?This might sound like a lot, but you're already on the right path! With proper preparation and practice in presenting these skills effectively, you’ll lay a solid foundation for your consulting career. Key TakeawaysCase interviews are an essential part of the consulting industry. They’re a crucial element of the application process and bring benefits for both sides.For you as a candidate, they provide a first glimpse into the typical tasks of a consultant’s day-to-day work. They also give you the chance to showcase your skills directly during the interview. Additionally, case interviews help you identify your strengths and weaknesses. Even if things don’t work out, you’ll often receive valuable feedback to help you prepare for future interviews.For companies, case interviews are a vital tool for realistically assessing a candidate's abilities. They allow firms to check whether you have the right skills and can handle the demands of a consulting role. Overall, they provide an efficient and practical way to identify the best candidates.Case interviews are challenging, but they’re far from impossible to master — with the right preparation. Make use of our resources and take the first step toward your consulting career!