Glossary
What Is a Customer Interview?
Updated · Team Fonda
Short answer
A customer interview is a one-to-one conversation with a current or potential customer to learn about their problems, habits and spending. Founders use it to test whether an idea solves a real problem before building anything. A good one is mostly listening and asks about the past, not about your idea.
Key takeaways
- Ask about what people did, not what they would do.
- Do not pitch. The moment you sell, you stop learning.
- Listen for effort and money already spent on the problem.
- Write notes the same day and tally the same points across interviews.
What a customer interview means
It is a short, informal conversation, often 20 to 30 minutes, with someone who fits your picture of the customer. You are there to understand their world: when the problem shows up, what it costs them, what they have tried. It is the main tool of customer discovery.
It is not a sales call, a focus group or a survey read aloud. One person, open questions, and room for them to take the conversation somewhere you did not expect.
How to run a customer interview
- Pick who to talk to. Use your ideal customer profile. People who have had the problem recently give the best answers.
- Ask for a little time, and be honest. Say you are researching a problem and not selling anything.
- Prepare five or six open questions. Treat them as a guide, not a script.
- Start with their situation, then move to the last time the problem happened.
- Follow up. "What did you do next?" and "Why was that hard?" bring out the detail.
- Close with two requests: "Is there anything I should have asked?" and "Who else should I talk to?"
- Write up your notes the same day while their exact words are fresh.
| Avoid asking | Ask this | Why |
|---|---|---|
| Would you use an app that does X? | How do you handle X today? | Shows real behavior, not politeness |
| Is this a big problem for you? | Tell me about the last time this happened. | A specific story is harder to exaggerate |
| How much would you pay? | What have you spent trying to fix this? | Past spending predicts future spending |
| Do you like my idea? | What have you already tried, and what went wrong? | Reveals what a solution must beat |
This way of asking is the core of The Mom Test, a book by Rob Fitzpatrick about how to talk to customers and learn whether a business idea is good when people tend to tell you what you want to hear. The fix is to ask about the person's own life and past actions, where a polite answer and a true answer are the same thing.
A worked example: scoring ten interviews
This example uses invented numbers. Say you are exploring a service that plans weekly meals for parents of children with food allergies. You speak to ten parents and mark each conversation on the same four signals.
| Signal | Parents out of 10 |
|---|---|
| Raised meal planning as a stress before you mentioned it | 7 |
| Had built their own workaround, such as a spreadsheet or saved recipe list | 6 |
| Had paid for something to help, such as a specialist cookbook or a dietitian visit | 4 |
| Offered to introduce you to another parent | 5 |
Seven of ten raising it unprompted suggests the problem is real. Four of ten having already paid suggests some will pay again. The parents with spreadsheets are the ones to go back to first, because building a workaround is strong proof that someone cares. If instead only one of ten had done anything about it, kind words from the other nine would not change the picture.
Why it matters for a first-time founder
Interviews come before you build, at the stage covered in how to validate a startup idea. They cost a coffee and an hour, and they can show an idea is weak months before a finished product would. They also give you the exact words customers use, which later become your website copy and your pitch.
They keep paying off after launch. The people you interviewed are a natural place to look for your first 10 customers. In Fonda, Interviews is a step in the Validate phase, and you talk to real customers before you receive a Verdict. Marty, your AI co-founder, remembers your project, so you can ask it questions at that step as you prepare.
Common mistakes
- Talking more than the customer. If you spoke for most of the call, you ran a pitch.
- Leading questions. "Don't you hate it when..." tells them the answer you want.
- Accepting vague praise. When someone says "I would use that", ask what they use now and why they have not switched.
- Interviewing only people you know. Strangers who fit the profile are more honest.
- Not taking notes. Memory keeps the answers you liked. Ask permission before recording.
- Interviewing several people at once. In a group, the loudest voice sets the answer.
Related terms
Interviews are one form of primary market research. The interviewees who feel the problem most sharply are your likely early adopters.
Frequently asked questions
How do I find people to interview?
Go where your customers already spend time: online communities, local groups, trade events, or the places they work and shop. Ask your wider network for introductions to people who fit the profile, and end every interview by asking who else you should speak to.
Should I pay people for a customer interview?
For consumers, a coffee or a small gift card is a fair thank-you and is often not needed. Busy professionals may expect more for their time. Be aware that payment can attract people who want the reward more than they have the problem.
Should I show my product or prototype in the interview?
Not in the first part. Learn about the problem and their current habits first. If you have something to show, bring it out at the end and watch what they do with it, which tells you more than asking what they think.