McKinsey Interview - Common Case Types

Hi,

First of all, with three weeks only I would be very deliberate about how you spend the time. McKinsey cases are interviewer-led and specifically test whether you can build a structure tailored to the exact problem, so a memorised "standard" framework is likely to hurt you. On your questions specifically:

1. On case types, I'd recommend you get familiar with profitability, market sizing and market entry, growth/revenue, M&A/investment, pricing and operations.
2. On profitability structure, I would almost always add a market/external view alongside revenue and cost, since looking at competitors and market context in parallel usually gets you to the real driver faster.
3. On note-taking, set up your page before they finish talking (objective at the top, room for your structure, a column for numbers) and capture only keywords and figures.
4. On volume, there is no magic number, but the most important thing is to train with experienced peers and/or a coach (given your tight timeline, I'd strongly recommend you to invest on a coach).
5. On clarifying questions, better to always ask them and take advantage of the opportunity, but make sure they are relevant to the case and sharp (2-4 is a good proxy).
6. On where to practise, beyond the McKinsey site and PrepLounge case library, look for interviewer-led cases, and, as said, leave solo and switch to peers/coaches as soon as you can.

Hope it helps, and feel free to DM me if you want to discuss how to best prep for your upcoming interview.

Best,

Federico

Hi,

Start with the most important thing: memorising frameworks is the wrong approach. They don't ask for a framework, they ask what factors you'd consider, and canned structures are visible immediately. Learn the underlying logic instead, then build to the specific objective every time.

On your questions:

• Which case types. Beyond profitability and market entry, cover growth strategy, pricing, cost reduction, M&A and operations. But the bigger point is that McKinsey cases are often non-standard, so the return on a fifth framework is much lower than the return on being able to build one from scratch.
• Profitability structure. Revenue and cost is the right spine, and everything else hangs under it. Adding a "market" bucket alongside them isn't wrong, but only if the case actually calls for it, for instance when the decline could be industry-wide. Different sources give different frameworks because there isn't one correct answer; there's only what fits the objective.
• Note-taking. Don't transcribe. Write only the objective, the numbers, and the constraints. Set up your page before the case starts, and ask them to repeat a figure if you need it.
• How many cases. Aim for 25 to 30, and you need a human partner for at least half of them. Solo and AI practice is fine for structuring drills, but it won't fix pacing, pushback or presence. Find partners (or a good coach)  here on Preplounge.
• Clarifying questions. Only when you genuinely need something. Two is plenty, and asking for the sake of it wastes your time.
• Where to practise. Casebooks from the top MBA consulting clubs are a good source for solo prep, but here on Preplounge you'll find tons of peers and coaches you can leverage.

Best,
Franco

A few thoughts based on coaching a lot of McKinsey candidates.

First, I wouldn't spend too much time memorizing frameworks. McKinsey isn't looking for candidates who can recite a profitability or market entry framework—they're looking for candidates who can build a structure tailored to the specific question.

For example, a profitability case doesn't always have to be "Revenue + Costs." Sometimes that's exactly the right approach. Other times it makes sense to start with customers, products, or another angle. The structure should follow the problem, not the other way around.

For your other questions:

• Taking notes: Don't try to write everything down. Capture the objective, key facts, numbers and constraints. Interviewers don't expect a transcript.
• How many cases? Quality is much more important than quantity. I'd rather do 20 well-reviewed live cases than 50 where you repeat the same mistakes.
• AI vs. partners: AI is useful for drills and brainstorming, but I'd strongly recommend practicing with real people as well. The interview is a conversation, and that's difficult to replicate with AI alone.
• Clarifying questions: Yes, but only when they genuinely help clarify the objective or remove an ambiguity. Don't ask questions just because you've been told you should.
• Practice material: The McKinsey website is a good start. After that, I'd use high-quality casebooks from top business schools and, most importantly, practice with partners or coaches who understand how McKinsey interviews differ from other firms.

With three weeks, I'd spend much less time studying frameworks and much more time doing structure drills, exhibit interpretation, math drills and live cases. In my experience, that's what moves the needle the most.

Hi,

first of all Congrats on your invitation to McK interviews! 

In general, memorizing frameworks is rarely the right approach. And with only three weeks left you need to be very efficient with your prep. The best thing you can do is practice as many McK-style interviews with real people that qualify to give good feedback. 

McKinsey is interviewer-led. You'll be guided through the case, but within that structure you need to be as comprehensive and rigorous as possible and also expect a lot of chart reading along the way. This is meaningfully different from the candidate-led style at BCG or Bain, where you drive the structure yourself from the start. Make sure you specifically practice the interviewer-led format so you're familiar with that choreography before the real thing. 

On frameworks: They are helpful to structure your thought process but do not substitute case prepping. The most common ones are profitability, revenue growth (new product, new market, etc.), market sizing, M&A, pricing, and operations. But they should only serve as a red line for your own thinking. The actual structure needs to be specific to the case in front of you. 

• Note-taking: I always follow a specific method here — note all the important information on one sheet of paper. The important thing is to only write down the crucial bits, otherwise you get lost in the data. This takes practice, so build it into your case reps rather than treating it as a separate skill.
• How many cases: 30–50 would be ideal. I'd strongly urge you to get a practice partner (PrepLounge, WhatsApp groups, etc). Nothing substitutes for human interaction, including the pressure that comes with it. Happy to connect you with other coachees of ours if that helps.
• Clarifying questions: yes, absolutely, they're key. If you don't fully understand the assignment or the information in front of you, you cannot solve the case.
• Where to find McKinsey-specific cases: best through people who are currently also interviewing for McKinsey, coaches, and other sites (e.g. CaseCoach). Reach out if you need some McKinsey-specific cases.

I'm quite proficient with the McKinsey way of interviewing. Reach out anytime in case of questions!

Best,
Sebastian

Focus on cost optimization, M&A due diligence, growth strategy, and pricing. Do not memorize off-the-shelf frameworks; build customized issue trees based on the client's specific model. For profitability, always add contextual buckets like market dynamics or execution risks if relevant to the core prompt.

Use shorthand and split-page note-taking to write efficiently. Practice 20 to 25 cases out loud, asking clarifying questions only to verify ambiguous terms or core objectives. 

Feel free to reach out if you want to discuss your preparation further.