The Mom Test — Customer Interviews That Don't Lie to You

Overview

The Mom Test (Rob Fitzpatrick, 2013) is a way to talk to customers so that even your mom can't give you a false positive. The rule: ask about their life and past behavior, never about your idea. Compliments, hypotheticals ("would you buy?"), and pitch-then-ask all generate flattering noise founders mistake for validation. Good interviews collect facts about what people already do, pay for, and struggle with.

When to Use

• Before building, to test whether a problem is real and painful
• When early "positive" feedback isn't converting to usage or revenue
• Choosing between problems/segments to pursue

The Process

1. Talk about their life, not your idea. Never mention the product first. Ask what they're trying to get done and how they do it today.
2. Ask about specifics in the past, not opinions about the future. "When did you last hit this problem? Walk me through it." not "Would you use X?"
3. Dig for the three currencies of commitment: time, reputation risk, money. Real pain shows up as workarounds already paid for.
4. Anchor vague claims to reality. "Always" → "how many times last month?" "I'd pay a lot" → "what do you pay now?"
5. Shut up and listen. Talk <30% of the time. Gate: if you pitched or they complimented the idea, that data is contaminated → discard it.
6. End with a real advance, not a compliment: an intro, a pre-order, a follow-up meeting, access to data. Gate: no advance offered = you learned nothing actionable → the interview failed.