What is the Mom Test?
The Mom Test, from Rob Fitzpatrick’s book of the same name, is a framework for designing customer interview questions that produce honest signal even when the interviewer’s own mother is the respondent. The premise: most customer-interview questions are so leading or so polite that even people who love the founder will give worthless answers. The Mom Test inverts the process — ask questions a politely-evasive respondent cannot fudge.
The three core rules
(1) Talk about their life, not your idea — instead of “would you use my app?”, ask “tell me about the last time you had this problem.” (2) Ask about specifics in the past, not generics in the future — “how did you handle X last week?” beats “would you try a new way to handle X?” (3) Talk less, listen more — the goal is to learn about the customer’s reality, not to pitch your solution.
Why polite questions fail
People naturally avoid disappointing the asker. When founders ask “would this be useful?”, the respondent calculates the social cost of saying no and almost always lies. The data produced is worthless because it doesn’t predict actual behaviour. The Mom Test redirects the conversation to factual history (which is hard to fake) rather than hypothetical commitment (which is easy to fake).
Bad questions vs. Mom-Test questions
Bad: “Do you think this is a good idea?” — invites flattery. Mom-Test: “Tell me about the last time you ran into this problem.” Bad: “Would you pay for this?” — invites enthusiasm. Mom-Test: “How are you solving this today? What are you using and what does it cost?” Bad: “Do you like X feature?” — invites approval. Mom-Test: “Walk me through how you handled the last time you needed X.”
The commitment ladder
Fitzpatrick’s framework also includes the “commitment ladder”: each interview should escalate toward a meaningful commitment. Time commitment (“can I see your workflow next Tuesday?”) is stronger than verbal commitment (“yes I’d use it”). Money commitment (LOI, deposit, beta payment) is strongest. Polite “yes I’ll try it” without a commitment ladder is worthless data; commitment is the validation.
Türkiye context
Türk conversational culture has stronger politeness norms than US/Northern European startup ecosystems — direct contradiction is socially costly, and “kullanırım, müsait olur olmaz” (I’ll use it as soon as I’m available) is the standard polite deflection. Mom Test discipline matters even more in Türk customer interviews: founders who don’t adapt their question style get systematically over-positive signal that doesn’t predict adoption. Focusing on past behaviour and time/money commitments produces dramatically truer Turkish customer signal.
Related: Customer Development, Get Out of the Building, JTBD, Painkiller vs Vitamin.