McKinsey Case Prep - Questions

Great questions, these come up a lot and getting them right early makes a big difference.

On the hypothesis:

Think of it as a working direction grounded in either experience or data (or both), as Franco mentioned already. After hearing the prompt, something like "Based on what you've shared, my initial thinking is that this is likely driven by X. I'd like to test that by starting with [branch of your structure]" is enough. You're not committing to an answer. You're showing the interviewer you can orient yourself and prioritize.

The mistake most candidates make isn't stating the hypothesis too early. It's treating the structure as a checklist instead of a tool to investigate and test that hypothesis. Once you lay out your issue tree, pick the branch most likely to confirm or kill your hypothesis first. That's what McKinsey means by "hypothesis-driven." It's about sequencing your analysis smartly, not about being right on your first guess.

From my experience at McKinsey, what matters is showing you can form a point of view quickly and adapt it as new data comes in. Nobody expects you to nail the answer in minute two. But you do need to have a direction, not just a list of things to explore.

On frameworks:

I personally don't teach frameworks. In my experience, canned frameworks do more harm than good. They give candidates a false sense of security and the moment a case doesn't fit the template, they freeze.

That said, if you're just starting out, frameworks can be useful for your very first cases just to avoid the blank canvas effect and get a sense of how a structure looks. But treat them as training wheels, not a long-term strategy.

What actually works is building your structuring muscle. That means learning to break down any business problem from first principles, using logic and business sense, not pulling a memorized 2x2 off the shelf. It's harder at the beginning, but it's the only approach that holds up when the interviewer throws you something you've never seen before.

A practical tip: after you practice 10-15 cases, look back at what structures you built and why they worked. You'll start developing your own intuition for how to break problems apart, and that's worth more than any framework book.

Good luck with your prep!

Hi,

Starting from you first question: stating a hypothesis is not about throwing the dice, so at the very beginning of the case it does not make much sense because you simply do not know enough yet.

A good hypothesis should usually be built either on:

• previous experience (e.g. you already worked on a similar problem or know the industry very well), or
• early evidence emerging during the case.

So I would avoid forcing a hypothesis before starting the analysis phase, unless you have strong prior knowledge that allows you to make an informed assumption.

A lot of candidates misunderstand what interviewers are looking for here. The goal is not to randomly guess the answer early; the goal is to show that you can progressively form and refine a point of view as evidence emerges.

Regarding frameworks, there are definitely different frameworks for different types of cases, but there are two important things to keep in mind:

1. You will never be able to memorize a framework for every possible case.
   At some point, you need to become comfortable building structures from scratch.
2. Pre-packaged frameworks can backfire badly if used blindly.
   If you try to force-fit a memorized framework into a case, it often becomes obvious to the interviewer that you are just copy-pasting something you learned mechanically.

What I usually recommend is:

• become familiar with the most common frameworks and business concepts;
• understand the logic behind them;
• then use your brain to adapt them to the specific situation.

That means sometimes removing buckets that are not relevant, sometimes adding completely new branches depending on the context.

Hope it helps and feel free to DM me if anything is not clear,
Best,
Franco

hey!

For McKinsey you don’t force a hypothesis in the first minutes if you have no data; start with a clear issue tree, then form a hypothesis once you see which branch actually matters. McKinsey cares about structured thinking, not guessing. The most common question types are diagnostic questions (why is performance down), sizing, prioritisation, and chart interpretation. There’s no template for every case, but the best prep is mastering a few universal skills: breaking problems into MECE buckets, testing one branch at a time, and giving crisp, top‑down answers.

Alessa

Great questions!

The answer to the first one is a confident 'no'. 

No, you shouldn't state a hypothesis at the start of every case. You should start a hypothesis at the earliest point in the case when you have sufficient evidence to support that hypothesis. Otherwise, you can't really call it a hypothesis.

This is one of the reasons why some prep materials that are still being used no longer reflect the interviewing process and culture at the moment. 

RE your second question, yes, there are some types of cases (e.g., M&A cases) but I would recommend against trying to come up with 'typical structures' that you always apply. Instead, I would learn how to structure cases from first principles just like consultants do. 

Feel free to reach out for an intro call if you need help, especially since you'll be interviewing with McKinsey. 

Best,
Cristian  

1. Hypothesis. Yes, attempt one, but after your structure, not before. The right sequence is restate the problem, ask 2 to 3 clarifying questions, lay out your structure, then state an initial hypothesis. If you don't have enough info, say so honestly and share your initial intuition. Pick the branch with the strongest hypothesis to start, or ask the interviewer which area to explore first.
2. Common question types. Structuring (MECE trees), quantitative (market sizing, breakeven), exhibit reading, brainstorming (group in 3s), and recommendation (lead with the answer). For PEI, prepare Drive, Leadership, and Courageous Change stories.

Don't memorise templates. Build pattern recognition through 30 to 40 live cases.

Good luck.