The discovery interview questions that actually get honest answers

"Would you use this product?" is the worst question you can ask in a customer interview. The answer is almost always yes—and almost always meaningless.

After hundreds of customer discovery interviews, I've learned that getting honest answers requires specific techniques that fight against our natural tendency to be polite and agreeable.

The Mom Test Principle

Rob Fitzpatrick's "Mom Test" captures the core insight: ask questions so good that even your mom couldn't lie to you. The key is to ask about specific past behavior, not hypothetical future actions.

Bad: "Would you pay for a solution to this problem?" Good: "Tell me about the last time you tried to solve this problem. What did you do?"

Bad: "Do you think this is important?" Good: "Where does this rank in the problems you're actively trying to solve right now?"

Questions That Work

Understanding the Problem

• "Walk me through the last time you dealt with [problem area]."
• "What have you tried so far? What happened?"
• "How much time/money/effort are you currently spending on this?"
• "If this problem magically disappeared tomorrow, what would change for you?"

Testing Assumptions

• "What would need to be true for this to be worth your time?"
• "What's the biggest risk you see with this approach?"
• "Who else would need to be involved in a decision like this?"
• "What would make you switch from what you're doing today?"

Spotting Polite Lies

Watch for red flags:

• Generic compliments ("This is great!")
• Future commitments ("I would definitely use this")
• Hypothetical enthusiasm ("If it had X feature, I'd love it")

Dig deeper with: "Can you give me a specific example?" or "Tell me more about why that matters to you."

The Structure That Works

Start broad, then narrow:

1. Context: "Tell me about your role and what you're working on."
2. Problem exploration: "What's challenging about [area]?"
3. Current solutions: "How are you handling it today?"
4. Priorities: "How does this compare to other problems you're facing?"
5. Commitment test: "What would you need to see to take the next step?"

The Bottom Line

Good discovery interviews feel like conversations, not interrogations. But they require discipline to avoid the trap of validation-seeking questions that generate polite agreement instead of useful truth.