Entrepreneurship.

The Mom Test

5 min read·Apply by lunch

The question

Of all the conversations you've had about your idea, how many produced an actual fact about the other person's past — what they did, what it cost them, what they've already paid or built to make it stop — rather than an opinion about your future; and what would be left in your notes if you deleted every compliment?

The idea

Rob Fitzpatrick had run startups and spent years watching founders — himself included — walk out of customer meetings full of energy and carrying no information. In 2013 he self-published a short book about why. The Mom Test is named for the person least able to tell you the truth about your idea, and the joke has a point: it isn't that mothers lie, it's that a badly built question makes anyone lie, kindly, without noticing they've done it. What makes this harder than a discovery call is that nothing is at stake for the other person. In discovery there's a deal on the table, a budget to defend, a signature at the end — reasons to be straight with you. Here there's no money, no calendar, no consequence, and being kind costs them nothing at all. That leaves one source of evidence they can't manufacture to please you: what this problem has already cost them, before you arrived and before your product existed. The trap is that these conversations feel productive in direct proportion to how useless they are — the meeting where everyone loved it is reliably the one that produced no facts.

The framework

01
Two piles: facts, and everything else
Sort every line of what you hear into two piles. One holds facts: what happened, when, how much, to whom, and what they did about it. The other holds compliments, hypotheticals and promises about what they'd do once the thing exists — and that pile, however large and however warm, is worth nothing. Anything phrased in the conditional belongs in it, along with 'definitely', 'we'd absolutely use that' and 'let me know when it's ready'. Keep the two separate on the page, because they blend beautifully in memory, and the pile that survives the walk back to your desk is reliably the wrong one.
02
What has this already cost them?
Problems people genuinely care about leave a paid trail. Ask what the last occurrence cost — in money, in hours, in a client lost or a weekend burned — then ask the sharper version: what have you already tried, bought, hired or built to deal with it? A spreadsheet somebody maintains by hand at eleven at night outweighs any quantity of stated enthusiasm, because it's a cost a real person chose to bear before you turned up. And if the honest answer is that it has cost them nothing and they've done nothing about it, you've learned the most valuable thing on offer: this is an annoyance, not a problem.
03
The question does the lying for them.
Ask 'would you use this?' and you've asked someone to forecast their own behaviour while being pleasant to you; you'll get a yes that costs them nothing and means less. The repair is grammatical before it's anything else. Put every question in the past tense and in their life rather than your product — walk me through the last time this came up, what did you do, who else got dragged in, what happened afterwards. It feels wrong, because you came to talk about the thing you've been thinking about for months. But your idea entering the room is the moment they stop reporting and start reacting.
04
End on a commitment, not a compliment.
Enthusiasm only converts into evidence when you ask for something that costs them: time in a diary, an introduction to someone whose opinion they'd hate to waste, or money — a deposit, a pre-order, a letter of intent. The discovery call already taught you how to run that close and how to read a gracious deflection; the only thing that changes here is what it's for. You're not qualifying a buyer, you're finding out whether the problem was ever real.

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