Customer Interview Questions for Honest Answers
The questions you ask decide whether you hear the truth. Ask about the past and specifics, and people give you facts. Ask about the future or your idea, and they give you kindness.
What questions should you ask in a customer interview?
Ask about specific past events and current behaviour: ‘Tell me about the last time this happened’, ‘What did you do next?’, ‘What does that cost you?’, ‘What have you tried?’. Avoid questions about the future and your idea, such as ‘Would you use this?’, because people answer them politely rather than accurately. Rob Fitzpatrick’s book The Mom Test is built on this rule.
Which questions work best?
These questions are grouped by what they uncover. You won’t ask all of them in one call; pick three or four from each group and follow the story the person tells you.
| Purpose | Questions |
|---|---|
| The story | Tell me about the last time this happened. What triggered it? Walk me through what you did, step by step. Who else was involved? |
| Current solution | How do you handle it today? What tools or people do you use? What do you like and dislike about that? What have you tried that didn’t work? |
| Cost and impact | How much time does it take? What happens if it goes wrong? Has it cost you money or a customer? How often does it happen? |
| Priority and budget | Where does this rank among your problems this quarter? Have you looked for a solution? Who would approve spending to fix it? Is there a budget for it? |
| Close | Is there anything I should have asked? Who else should I talk to? Can I follow up when I have something to show? |
Which questions should you avoid?
Avoid three kinds of question: hypotheticals about the future, opinions about your idea, and leading questions that suggest the answer. They feel useful because people say yes, but the answers don’t predict behaviour.
| Avoid | Why | Ask instead |
|---|---|---|
| Would you use a tool that…? | Hypothetical; costs nothing to say yes | How do you handle this today? |
| Do you think this is a good idea? | Invites politeness | What have you tried to fix this? |
| Wouldn’t it be great if…? | Leading; suggests the answer | What’s the hardest part of this? |
| How much would you pay? | Guesses are unreliable | What do you spend on it now? |
How do you follow up on answers?
Follow up on anything emotional, vague or surprising. ‘That sounds frustrating, what happened then?’ and ‘Can you give me an example?’ turn general answers into facts. Silence also works: pause after an answer and people often add the most useful detail. Capture the exact words, which later shape your messaging and landing page tests. How to run the call itself is on customer discovery interviews.
Facts from the past beat promises about the future.
What people did last month tells you more than what they say they’ll do next year.
How do you tell a strong answer from a weak one?
A strong answer contains a specific recent event, a cost, and something they already do or pay to solve it. A weak answer is general, future-tense or polite. Track both in your notes, and judge the idea on strong answers only. Real signals vs false positives covers this in more detail, and problem vs solution validation explains when to start showing a solution.
Frequently asked questions
What are good customer interview questions?
Questions about specific past events and current behaviour, such as ‘Tell me about the last time this happened’ and ‘What did you do next?’.
What questions should I avoid in customer interviews?
Hypotheticals, opinions about your idea and leading questions, such as ‘Would you use this?’.
What is The Mom Test?
A book by Rob Fitzpatrick on asking customer questions that even your mother couldn’t lie to you about, by focusing on their life rather than your idea.
Should I ask customers how much they would pay?
Ask what they spend on the problem now. Guesses about future prices are unreliable.
How do I get specific answers?
Ask for the last time it happened and follow up with ‘Can you give me an example?’.
How many questions should I ask in one interview?
Three or four from each group, following the story the person tells.