Answer
Define your ideal customer profile by understanding a situation, not inventing a person: who experiences the problem most strongly, why they would act now, whether they can and will pay, and how you can reach them. Then test what you think you know against evidence.
The name, the age and the face come last.
Martin Dubreuil
September 24, 2026
The classic exercise starts with a person. She's 42, lives in London, drives an Audi, does yoga.
None of that explains why she would buy anything from you.
An ideal customer profile is only useful if it explains the commercial situation: the problem, the reason to act, the ability to pay and the route to reach them. Demographics belong in it when they change one of those things. Otherwise they're decoration.
A fictional biography is not customer understanding.
If you can only answer three of these well, start with the problem, the trigger and the money. A customer with a real problem, a reason to move now and the ability to pay is worth far more than a detailed description of someone who has none of the three.
A target market is the broad group you could sell to. It tells you where to look.
An ideal customer profile defines the customers you're best placed to serve and most likely to succeed with. It tells you who to understand.
A customer persona, avatar or buyer persona is one illustrative person who represents that profile. It makes the profile easier to write for.
The persona should be the output of the profile, not the starting point.
Treat your first ideal customer profile as a hypothesis, because that's what it is.
Mark every statement as something you know from evidence or something you're assuming.
Find the assumption that would hurt most if it were wrong. Usually it's the trigger, willingness to pay or reachability.
Talk to people who match the profile about the last time the problem actually happened, and what they did about it.
Then put a real offer at a real price in front of them.
What people do tells you more than what they say, and what they pay for tells you more than what they praise.
I've written a full guide on how to define your ideal customer, covering the six questions behind a useful customer profile, why customer psychology changes along the journey, and who you should deliberately exclude.
It includes a one-page Customer Architecture Map you can print, and an AI prompt that turns a completed map into a realistic persona without making your assumptions sound like facts.
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The full guide, with the Customer Architecture Map and two AI persona prompts.
Customer, demand, willingness to pay, reachability and economics, tested with evidence.
How a business connects customer, offer, economics and execution into one coherent system.
I've written about a lot of what goes into starting and building a business. The answer may already be here. If it isn't, challenge accepted.