The big idea: A primary persona is one named user who stands for the attributes of a whole population — built from research data, never invented.
A scenario puts that person into a specific situation. Together they turn data a team argues about into a decision a team can make.
Research → persona → scenario → decision, on one real product. Step through to the end: a persona that never changes a decision was decoration.
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Four tools, four jobs
Primary persona
One named user with goals, context and constraints. Sara, 34, ward nurse, 12-hour shifts, gloves on. Specific enough to picture, drawn from data.
Scenario
That persona doing the task in context: setting an infusion rate at 3am with one hand free. The time, the light and the free hand are all constraints a persona alone does not surface.
Population stereotype
An expectation a whole population shares — red means stop, clockwise means more. Design with it and the product is instantly usable; design against it and users err under pressure.
Demographics
The measurable make-up of the population — age, income, location, occupation. Demographics say who; personas say what they are like.
The test of a good persona: It changed a decision. If you can delete the persona and every design choice stays the same, it was never doing any work.
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The guide asks you to discuss the advantages and disadvantages of using these tools. Both halves are examinable — and personas have a specific failure mode worth knowing.
Advantages
- The team shares one concrete user instead of arguing about an abstraction
- Design decisions can be tested against a scenario before anything is built
- Stereotypes make a product usable with no learning at all
- Demographics show whether the persona is representative
Disadvantages
- A persona built on thin data gives the designer's guesses authority
- "Sara wouldn't" ends an argument that should have been settled with evidence
- One primary persona can hide the diversity of the real population
- Stereotypes are population-specific and can entrench bias
The failure mode: A persona is a shortcut to shared understanding, not a replacement for users. When the team stops going back to real people because they have Sara, the tool has become the problem.
How this is tested — using personas, scenarios and population stereotypes, and knowing their limits. It comes up two ways:
Paper 1 — multiple choice
- Identify what makes a persona usable rather than decorative.
- Spot a design that works against a population stereotype.
Paper 2 — analysing a product
- Explain how a persona and scenario would guide a named product's development.
- Evaluate the use of a single primary persona for a diverse market.
The trap: Writing a persona as a biography. Age, job and a photograph change nothing. The parts that earn marks are the goals, the context and the constraints — the things that force a decision.
A company is designing a smart thermostat. Explain how a primary persona and a scenario would guide its development.
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