The Mom Test: Interviews That Don't Lie to You

Here's the problem with asking people about your idea directly: most people, including your own mother, will be nice to you. They'll say "yeah, I'd probably use that" — not because it's true, but because telling you your idea is bad feels rude. Rob Fitzpatrick calls this the Mom Test: a good customer interview should get you honest answers even from someone who loves you and wants to protect your feelings.

This isn't a fringe idea — it's taught at Harvard, UCL, and used inside accelerators like Seedcamp precisely because it's the single most common way first-time founders fool themselves.

The three rules

1. Talk about their life, not your idea. Don't ask "would you use an app that does X?" Ask about how they currently handle the situation your idea is meant to fix. Their actual behavior tells you far more than their opinion of your pitch.

2. Ask about specifics in the past, not hypotheticals about the future. "Would you pay for this?" is a guess dressed up as an answer — people are bad at predicting their own future behavior, and generous when it costs them nothing. "Tell me about the last time this happened to you" gets you a real memory, not a polite hypothesis.

3. Talk less, listen more. If you're doing more than 20% of the talking in a customer interview, you're pitching, not learning. The moment you start explaining your idea, people shift into being nice to you instead of being honest.

A concrete before/after

| Bad (leading, hypothetical) | Good (specific, past-tense) | |---|---| | "Would you use an app that helps you track expenses?" | "Walk me through the last time you tried to figure out where your money went last month." | | "Do you think this is a good idea?" | "What have you tried before to solve this? What happened?" | | "Would you pay $10/month for this?" | "What are you currently paying for, or doing manually, to deal with this?" |

Your task

Take the problem you wrote down in the previous lesson. Write three questions you'd ask someone who has that problem — using the past-tense, specific-life rule above, not the hypothetical-future one. Bring them to your next live session; your tutor will run a practice interview with you playing the customer.