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Here is a small experiment. Tell your mom you are thinking of starting a business that delivers fresh flowers to offices every Monday. Watch her face. She will probably say, “What a lovely idea! I’m sure it will do well.”
Now ask yourself: did you learn anything? Not really. Your mom loves you, and she does not want to hurt you. Her answer would be the same if the idea were terrible.
That is the problem a book called The Mom Test tries to fix. Its author, Rob Fitzpatrick, noticed that founders ask customers for opinions, get polite answers, and walk away believing they have proof. The book gives a way to talk to customers so that even your mom, or a stranger being kind, cannot lie to you by accident. Let’s walk through it in plain language, with examples you can use this week.
Why people lie to you (and they don’t mean to)
Most people are not trying to deceive you. They are being polite. When you say “I’m building this thing, what do you think?”, the easiest and kindest answer is “sounds cool.” It ends the awkward moment and makes you smile.
There is a second reason. People are bad at predicting their own future. If you ask, “Would you use this?”, they imagine a better version of themselves, one who has more time and more discipline. Think of the gym membership you bought on January 1st. You really meant it when you signed up.
So the fix is not to find more honest people. The fix is to ask better questions. Questions that cannot be answered with a compliment.
The three rules, explained like you’re chatting with a friend
The book boils the method down to three rules, and they fit on a sticky note. As the book summarises it: talk about their life instead of your idea, ask about specifics in the past instead of generics or opinions about the future, and talk less and listen more.
Rule 1: Talk about their life, not your idea. The moment you describe your idea, people become reviewers. They judge it. But if you ask about their day, they become storytellers, and stories are full of facts. Instead of “Would you like an app for tracking your expenses?”, try “How do you keep track of your money at the moment?”
Rule 2: Ask about the past, not the future. What someone did last week is a fact. What they say they will do next month is a guess. “Would you pay for a tool like this?” invites a guess. “When did you last run into this problem, and what did you do?” invites a fact.
Rule 3: Talk less, listen more. It sounds obvious, but when we are excited about our idea we talk for most of the call. Try this rule of thumb: if you are speaking more than a quarter of the time, you are pitching, not learning. After you ask a question, wait. The silence feels long, but people often fill it with the most honest thing they say all day.
A made-up conversation: bad version and good version
Let’s use a hypothetical example, invented for this article. Say you want to build a tool that helps small tailors in a town manage customer orders.
The bad version goes like this. You say: “I’m building an app that helps tailors track orders. Do you think that’s useful?” The tailor smiles and says, “Yes, sure, that could help.” You leave happy and you learned nothing.
The good version goes like this. You say: “Tell me about the last busy season. How did you keep track of who ordered what?” The tailor pauses and says, “Honestly, I write it in a notebook, and last Diwali I mixed up two blouses and lost a customer.” Now you have a real story, a real cost, and a real current solution, which is the notebook. You can ask, “What did that mistake cost you?” and “Have you tried anything else?” You might even hear that a cousin built a spreadsheet and it did not work. Every one of those answers is worth more than ten polite yeses.
Good questions you can steal
You do not need a long script. A handful of questions will carry most conversations. Ask people to walk you through the last time the problem happened, from start to finish. Ask what was the hardest part, and what they have tried to fix it. Ask what it costs them in time or money, and whether they would be willing to pay for a better way. A good way to spot real pain is to ask: “Why haven’t you solved it yet?” If the problem is serious, they will have already tried something. If they have not tried anything, it might not hurt enough.
Finish every conversation with two simple questions: “Who else should I talk to about this?” and “Is there anything I should have asked but didn’t?” These questions often open the best doors.
Spot the fake signals
The book describes three kinds of bad data, and you can learn to spot them quickly. Compliments are things like “That’s awesome!” Fluff is vague talk about the future, like “I would definitely use that” or “I usually buy things like this.” Ideas are feature requests such as “You should add a dark mode,” which feel useful but are often noise unless you ask why the person wants it.
When you hear one of these, do not write it down as proof. Gently dig underneath. If someone says, “I’d love that,” ask, “What would that let you do that you can’t do today?” If someone suggests a feature, ask, “Why would that matter to you?” The answer behind the answer is where the truth lives.
End every conversation by asking for a small step
This is the part most people skip. After you have learned about their life, ask for something that costs them a little. It could be a follow-up call next week, an introduction to a colleague, a chance to try a rough version, or a small advance payment. The book calls these commitments. A person who gives up time, reputation, or money is telling you the problem is real. A person who says “keep me posted” and nothing else is being polite.
If you are testing an idea from our list, such as the business ideas born from everyday problems, try asking for a commitment in every call. It feels bold the first time and natural by the fifth.
Practical setup for your first five conversations
Choose five people who match your target customer. Keep each conversation short, around 15 to 20 minutes. Tell them upfront that you are learning, not selling. Take notes by hand or on your phone, and write down their exact words, not your summary. Right after each call, spend two minutes noting the strongest fact and the weakest guess. If you want a wider plan around these calls, our guide to validating a business idea in 7 days shows where they fit.
Do not worry about getting it perfect. You will ask a leading question or two at first. Notice it, laugh, and fix it in the next call.
What to do when the person is rude, rushed, or vague
Real conversations are messier than examples. Sometimes the person is in a hurry. Sometimes they answer every question with “it’s fine.” Sometimes they wander off topic and tell you about their cousin’s wedding.
If they are rushed, offer to ask just two questions and keep your promise. If they are vague, ask for a specific moment: “Can you think of the last time this happened? What was going on?” A concrete story forces a concrete answer. If they wander, let them for a minute. Stories about weddings sometimes turn out to contain the real problem, like a caterer who never sent an invoice on time.
If someone is negative about the whole idea, do not argue. Say, “That’s helpful. What would need to be true for this to be worth trying?” You are not there to win. You are there to learn what is real.
How to write up what you heard
After five or six conversations, put your notes on one page. Make three columns: facts (things people did or paid for), feelings (what annoyed or worried them), and guesses (things they said they might do). Facts get the most weight. Guesses get the least. If your idea only has support in the guesses column, you are not ready to build yet, and that is a perfectly useful result.
Key takeaways
- People are polite, so compliments are not proof. Design your questions to avoid inviting them.
- Talk about their life and past behaviour, not your idea and their future promises.
- Listen far more than you speak. Silence is a tool.
- Watch for compliments, fluff, and feature wishes, and dig under each one.
- End with a small commitment of time, introduction, or money to separate real interest from kindness.
The next time someone tells you your idea is great, smile, say thank you, and ask, “Tell me about the last time you had this problem.” That one sentence will teach you more than a month of guessing.
Have you tried a customer interview that surprised you? Share what you learned. And if you enjoy practical founder lessons, subscribe to the Weekly Founder Brief from FoundNXT.
