You are given a project with no clear definition of success. How would you proceed?

This is a hypothetical scenario question — the interviewer wants your decision framework, not a war story. Here is a model answer, the mistakes to avoid, and the follow-ups to expect.

A strong example answer

Executing toward an undefined target is how expensive rework happens, so the definition of success becomes my first deliverable. I'd draft a one-sentence straw man from what I know — the problem, the audience, the business context — and put it in front of the sponsor: 'Here's what I think winning looks like. What am I wrong about?' People correct concrete proposals far more readily than they answer abstract questions. From there we pin down the metric, the timeframe, and which constraints are real versus assumed, and I get sign-off in writing so there's a shared reference when priorities drift.

On an internal tooling project, the sponsor's vague ask — 'make onboarding better' — became 'cut setup time dramatically,' and we landed well past the target inside a couple of months. The written definition paid off twice: it guided two-week checkpoints, and when bandwidth got tight it told everyone exactly what could not be sacrificed.

A framework for your own answer

• Situation: Explain why a missing success definition is the real first problem.
• Task: Take ownership of defining success rather than waiting for it.
• Action: Draft a straw-man definition and get explicit sign-off.
• Result: Show how the clear target improved execution and scope decisions.

Common mistakes to avoid

• Start executing immediately and the target you eventually discover arrives as expensive rework.
• Candidates often ask an open-ended "what does success look like?" with no proposal to react to — bring a straw man instead.
• A definition kept private and never confirmed with the sponsor is no definition at all.
• Treat the first definition as provisional: checkpoint against it rather than engraving it.

Follow-up questions to prepare for

Interviewers use follow-ups to verify your story is real. If you get this question in a real interview, expect probes like:

• What if the sponsor refuses to commit to any metric?
• How do you handle success criteria that conflict between two stakeholders?
• What do you do if the definition of success changes mid-project?

Related practice questions

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