Hypothesis first, and frameworks as tools
Lead with a best guess, change it when the data disagrees, and use frameworks for ideas, never as a script.
Key takeaways
- Structure tells you where to look. A hypothesis tells you where to look first.
- A structure built for this exact decision gives a clear path. A list of frameworks could be pasted onto any prompt, so it tells the interviewer nothing about your thinking.
- Reciting a framework loses points: Reading a memorized framework out loud as your answer is a known way to fail.
Strong problem solvers do not analyze everything in random order. They lead with a hypothesis: a clear early guess at the answer, made before they have all the facts, which they then test. Instead of "let me look at everything," they say "I think the problem is probably the cost of materials, so let me check that first." If the data agrees, they move fast. If it disagrees, they have learned something and they change the guess.
How to form and use a hypothesis
- 1Form it from the prompt and common sense: "Fuel prices rose last year, so I suspect cost."
- 2Say it out loud, with the reason, after you present your structure.
- 3Say what data would prove it wrong: "If fuel cost per seat is flat, my guess is wrong."
- 4Update calmly when the data disagrees: "The data does not support that. Cost is flat, so I will move to the revenue side."
Key idea
Structure tells you where to look. A hypothesis tells you where to look first. Together they make you fast and focused.
The classic frameworks, and how to use them
You will hear about well-known frameworks. The profit tree (profit splits into revenue and cost). The three Cs (customers, company, competitors). The four Ps (product, price, place, promotion). The value chain. Supply and demand. Porter's five forces. These are useful checklists and sources of ideas.
Reading a memorized framework out loud as your answer is a known way to fail. Interviewers notice it quickly. Firms reward a structure built for the specific problem. Use frameworks in your head to find ideas, then build your own tree for this problem.
Prompt: "Should a gym chain launch a home-equipment line?"
Weaker answer
Says out loud: "I will use the three Cs. Customer. Company. Competitor. Then the four Ps. Product, price, place, promotion." It is generic and does not touch the actual decision.
Stronger answer
Uses a few frameworks silently, then says: "I will look at three things: is the home-equipment market attractive and growing, can this gym brand win there given its strengths, and does the money work after the costs to build and ship. Let me start with whether the market is attractive."
Why the stronger answer wins: A structure built for this exact decision gives a clear path. A list of frameworks could be pasted onto any prompt, so it tells the interviewer nothing about your thinking.
Your hypothesis was "costs rose", but the data shows costs are flat. What do you do?
What is the right way to use a framework like the three Cs in a case?
Sources for this lesson (1)
- Recognized public explanations of case-interview concepts and frameworks
My notes on this lesson
0 of 5,000 characters. Saves automatically.
Try the 2 remaining checks and drills above to complete this lesson (0 of 2 done).
Spotted something wrong or out of date? Report a mistake. We check every report and correct the page.