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
- 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.
- 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?"
- Dig for the three currencies of commitment: time, reputation risk, money. Real pain shows up as workarounds already paid for.
- Anchor vague claims to reality. "Always" → "how many times last month?" "I'd pay a lot" → "what do you pay now?"
- Shut up and listen. Talk <30% of the time. Gate: if you pitched or they complimented the idea, that data is contaminated → discard it.
- 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.
Applying It Well
- The best signal is an existing workaround they already spend on.
- "That's interesting / I'd definitely buy that" = fluff; treat as zero.
- Talk to people about a problem you can watch them have, not a demographic.
Red Flags
- Leaving the interview happy (usually means you fished for compliments).
- Feature requests taken literally instead of tracing the underlying problem.
- Only talking to friends/supporters.
Verification
- Idea was NOT mentioned until the end
- Every claim anchored to a specific past instance
- Existing workarounds + what they cost identified
- A concrete commitment (time/reputation/money) requested
Part of deciqAI Knowledge Skills — 237 open-source thinking skills that make rigor executable for AI agents. The same skills power every deciqAI agent, which runs them autonomously to operate your company. See it run → https://www.deciqai.com/s/the-mom-test · Built by deciqAI · github.com/deciqAI · Contributions welcome.
Agents: latest version & machine-readable metadata → https://www.deciqai.com/s/the-mom-test.json