What is a customer persona from real data?
A customer persona is a one-page description of a typical customer, written as one person, that the whole team (even a team of one) uses to make decisions about product, words and channels. Building it from real data means every line on that page points back to something you heard or counted: an interview quote, an observed habit, a survey result.
The idea comes from software designer Alan Cooper, who introduced personas as a design tool in his book The Inmates Are Running the Asylum. Many personas have since turned into fiction: a stock photo, a cute name, “loves yoga and oat lattes”. That kind of persona feels useful and changes nothing. An evidence-based persona is plainer, and it settles arguments.
When should you use it?
- After at least 8 to 10 interviews and, ideally, a short survey. Without that, you are writing a guess with a face on it.
- When you are about to write a landing page, choose a channel or decide which feature comes first, and you keep saying “our users” without agreeing who they are.
- For any business type. B2B personas describe the person who feels the problem and, separately if different, the person who signs off on the purchase.
Skip it when you have no interviews yet. A “proto-persona” from your assumptions is fine as a starting list of guesses, as long as you label it that way and test it with problem interviews.
How do you do it, step by step?
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Gather your raw material in one place. Interview notes, survey export, screenshots of community posts. Give each source a code: I1 to I12 for interviews, S for the survey. You will tag every line on the persona with these codes.
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Split people by behaviour before anything else. List each interviewee in a sheet with 4 columns: trigger (what starts the problem), current workaround, money or time spent, how they found you. Sort by those columns. Groups that behave differently are different personas, even if they share an age and job title.
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Pick ONE persona to build. At this stage you want your first customer, the one you will serve in your beachhead segment. A second persona can wait until the first one pays you.
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Fill these sections, nothing more:
- Label: a short descriptive name based on behaviour, say “The 3-chair salon owner”. A first name is optional.
- Situation: where and when the problem shows up, in 2 sentences.
- Trigger: the event that makes them look for help.
- Today’s workaround: what they do now, step by step, and what it costs.
- Top 3 frustrations: each with a real quote.
- What they want instead: the result in their words.
- How they decide and buy: who else is involved, budget, where they pay.
- Where they spend time: the groups, newsletters, events and apps they named.
- Objections: what would stop them buying.
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Tag every line with its source and count. “Does her books on Sunday nights (I2, I5, I7, I9).” “62% pay for at least one other software tool (S, n=64).” A line with no tag gets deleted or moved to an “assumptions to test” box at the bottom.
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Cut the trivia. Hobbies, favourite brands, star signs and pets stay out unless an interview showed they change behaviour. Age and gender go in only if your data shows they matter for the decision.
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Test it with 2 new people. Show the persona to 2 people from the segment you haven’t interviewed: “Does this sound like you? What’s wrong?” Fix what they correct. Then pin it next to your desk.
What does a worked example look like?
Say Amara, a hypothetical founder, is building simple bookkeeping for independent hair salons. She has 12 interviews and a 64-answer survey.
Step 2 changes her plan. Her interviewees split into two groups: stylists who rent a chair in someone else’s salon, and owners of small salons with 2 to 4 staff. The chair renters track income in a notes app and are happy. The owners mix staff wages, product costs and tips in one bank account and dread the end of the quarter.
Her persona, “The 3-chair salon owner”, includes: “Does the books on Sunday night after a 6-day week (I2, I5, I7, I9)”, “Trigger: a letter from the tax office or an accountant’s bill (I3, I5, I8)”, quote: “I became a hairdresser to cut hair, and now my Sundays are receipts” (I7), and “Hangs out in a regional salon owners’ WhatsApp group and at the yearly trade fair (I2, I4, I9, I11)”.
The photo, a made-up age and “enjoys travel” stay out. In exchange she gets one channel to test first and a headline in her customers’ own words.
Which free tools help?
| Tool | What you use it for | Free plan |
|---|---|---|
| Google Sheets | Sorting interviewees by behaviour, survey counts | Free |
| Google Docs | Writing the one-page persona with source tags | Free |
| Canva | Laying out a clean one-page version to share | Free plan with templates |
| Miro | Putting persona next to your empathy and journey maps | Free plan with a limited number of editable boards |
What mistakes should you avoid?
- Starting with demographics. “Women, 30 to 45, urban” describes millions of people with nothing in common. Behaviour and triggers describe customers.
- Making 5 personas at once. You cannot write one headline for 5 people. Pick one and earn the right to a second.
- Inventing details to make it feel real. Every invented detail is a decision you will later make on fiction.
- Writing it once and forgetting it. Update it after every 5 new conversations. Lines that stop showing up go.
- Confusing the user with the buyer. In B2B and in products for children, the person with the problem and the person who pays are different. Note both.
How do you know it worked?
Hand the persona to someone who has never seen your notes and ask them to write a 1-sentence ad. If the ad names the right trigger and uses the customer’s words, the persona works.
Our rule of thumb: at least 80% of lines carry a source tag, each of the top 3 frustrations is backed by at least 3 people, and the 2 people from step 7 say “that’s me” with only small corrections. If they say “not really”, your segment is mixed. Go back to step 2.
What should you do next?
Turn the persona’s inner world into an empathy map, and use the “where they spend time” section to plan your SEO content plan or first outreach. If the evidence is still thin, run a short survey first. If you want to test your persona against an AI co-founder’s questions, the startup game for women by Fe/male Switch does exactly that as part of validation.
FAQ
What should a customer persona include?
The situation in which the problem appears, the trigger, the current workaround and its cost, the top frustrations with quotes, how they buy, where they spend time and their objections. Skip hobbies and personal trivia unless your data shows they affect buying.
How many customer personas should a startup have?
One at the start. A second only once the first group is buying, or when your data shows a clearly different group with a different trigger and budget.
What is the difference between a persona and a customer segment?
A segment is a group you can count and reach, like “salon owners with 2 to 4 staff in Portugal”. A persona is a portrait of a typical person inside that segment, used to make daily decisions about words and features.
Updated 26 October 2026 · Written by the Fe/male Switch team