These guides break down the mechanics of a case interview — how to structure an answer, what each firm actually listens for, and how the different case types (market sizing, profitability, market entry, and more) change what a strong answer looks like. They're written from the same rubric and firm-style patterns that power the live AI interviewer in the case library, so what you read here matches what you'll actually be scored on when you run a case. If you're deciding whether to read first or practice first: read one guide in the cluster that matches your target firm or upcoming case type, then run the matching case in the 73-case library while it's fresh. Come back here between practice sessions rather than trying to read everything up front — the guides are reference material, not a course to finish before you start.
How a BCG Platinion case differs from a core BCG strategy case, the framework BCG expects, a real technology-transformation case walkthrough, and the strong-signal/red-flag rubric that decides Strong hire versus No hire.
Updated August 22, 2026
What EY-Parthenon interviewers listen for, how the case differs from an EY technology case, and how to close with a commercial recommendation.
Updated September 25, 2026
How a McKinsey Digital case differs from a core strategy case, the hypothesis-first structure interviewers expect, and where to practice technology cases written in that register.
Updated September 25, 2026
How to do case math out loud: rounding, units, percentages, and the checks that catch a wrong number before you recommend on it.
Updated September 25, 2026
The four-part structure every strong case answer follows: restate the objective, build a hypothesis-driven framework, work it out loud with real numbers, then close with a clear recommendation and its trade-offs — covers the scoring rubric and common mistakes too.
Updated August 16, 2026
How to build a market-sizing tree, state assumptions, and sanity-check the number so the interviewer can follow the math.
Updated September 25, 2026
What MECE means in a case interview, how to test a structure for gaps and overlaps, and the mistakes that make a framework look tidy but miss the decision.
Updated September 25, 2026
How to handle Saudi and GCC cases — regulation, local content, city-level demand, and family or state ownership — without treating the Gulf as one market.
Updated September 25, 2026