Customer interviews: how founders ask better questions

Customer interviews are short, structured talks where you learn how people really solve a problem today. The goal is not to pitch your idea or to get praise. The goal is to collect facts about what customers did, what it cost them, and what they tried before. Founders who skip this step often build products nobody asked for.

Why customer interviews matter before you build

Most early ideas rest on guesses. You guess who has the problem, how bad it is, and what they would pay. Steve Blank, a Silicon Valley entrepreneur and teacher, built a method called customer development around this point. He argued that the facts you need are not inside your office. Founders have to get out of the building and test their guesses with real customers.

Eric Ries, in The Lean Startup (2011), made a similar case. He described "validated learning," which means you prove each belief with evidence before you invest more. An interview is the cheapest way to get that evidence. It costs a coffee and an hour, not months of development.

Sources: Wikipedia, "Customer development" (en.wikipedia.org/wiki/Customer_development); Wikipedia, "The Lean Startup" (en.wikipedia.org/wiki/The_Lean_Startup).

The trap: people want to be nice

Ask a friend, "Do you like my idea?" and you will hear yes. People do not want to hurt you. A polite yes tells you nothing about whether they will pay, switch, or even remember your product next week.

Rob Fitzpatrick wrote a short book on this problem, The Mom Test, first published in 2013. His point is that even your mother can give you useful facts if you ask the right kind of question. The book covers how to avoid biased feedback and how to tell whether a person is really going to buy.

Sources: Rob Fitzpatrick, The Mom Test, book website (momtestbook.com).

Five rules for better questions

Use these rules in every conversation. They are easy to remember and hard to follow when you are excited about your idea.

• Ask about their life, not your idea. Start with their work and their problems. Mention your product late, or not at all.
• Ask about the past, not the future. "Would you use this?" is a guess. "When did you last deal with this?" is a fact.
• Ask for specifics. Get the last time it happened, who was involved, and what they did next.
• Look for effort and money already spent. If a person has tried tools, hired help, or built a workaround, the pain is real. If they have done nothing, it may not matter to them.
• Talk less than they do. You are there to listen. Silence is useful, so let them fill it.

Watch for three warning signs in your own notes: compliments, vague claims such as "I always" or "I usually," and wish lists such as "I would love it if." Each one sounds helpful and gives you almost nothing you can act on.

Sources: Rob Fitzpatrick, The Mom Test, book website (momtestbook.com).

A simple 30-minute script

You do not need a long list. Six to eight open questions are enough. Here is a script you can adapt to any product.

1. Open (3 minutes). Thank them. Say you are doing research and not selling anything. Ask what they do in a normal week.
2. The problem (10 minutes). "Tell me about the last time you had to deal with this." Then ask: What happened next? What was the hardest part? How long did it take?
3. Current fixes (8 minutes). "What have you tried so far?" "What did it cost, in time or money?" "What do you not like about it?"
4. Priority (4 minutes). "Where does this rank among your top problems right now?" A real problem usually sits near the top.
5. Close (5 minutes). Ask, "Who else should I talk to?" and "Is it all right if I follow up?" Referrals are a strong sign that the person took the talk seriously.

Take notes in the person's own words. Write down exact phrases, numbers, and names of tools. Two people can describe the same pain in very different language, and that language later becomes your product page and sales pitch.

Sources: Steve Blank's customer development steps of discovery and validation, as described at Wikipedia, "Customer development" (en.wikipedia.org/wiki/Customer_development); Rob Fitzpatrick, momtestbook.com.

Who to interview and how many

Talk to people who actually have the problem. Friends and family are easy to reach, but they are the least reliable. Look for people in your target group through your own network, industry groups, or online communities, and ask for a short call.

There is no magic number. A common habit is to keep going until you stop hearing new things. If the answers differ a lot, you may be mixing two groups. Split them and interview each on its own.

Remote interviews work well. Video calls are normal in 2020 and make it easier to reach customers in other cities and countries. Ask permission before you record, and keep any recordings private.

What to do after the interviews

Right after each talk, spend ten minutes writing down the three most important facts you learned. Then mark what surprised you. Surprises are the most valuable notes, because they show where your guesses were wrong.

After a handful of interviews, look for patterns. How many people described the same problem? How many had already tried to fix it? How many agreed to a next step, such as a trial or a second call? Ask for a small commitment at the end, like time or an introduction. A commitment is real evidence. A compliment is not.

Then change something. Rewrite your idea, narrow your customer group, or drop the plan. Ries called this kind of change a pivot, and he treated it as a normal part of building a company, not a failure.

Sources: Eric Ries, The Lean Startup (Crown Business, 2011); Rob Fitzpatrick, momtestbook.com.

Sources

Fitzpatrick, R., The Mom Test (2013), momtestbook.com. Blank, S., customer development, summarised at en.wikipedia.org/wiki/Customer_development. Ries, E., The Lean Startup (Crown Business, 2011), summarised at en.wikipedia.org/wiki/The_Lean_Startup.