A research session can run smoothly and answer the wrong question because the people taking part have never faced the situation under investigation. Recruiting experienced customers for a first-use study, for example, may hide the very difficulties the team needs to see. Participant recruitment starts with deciding whose experience can inform the decision, then finding a practical and respectful way to involve them.

That work includes defining eligibility, choosing recruitment channels, screening, arranging participation and checking the resulting sample. The number of people who accept an invitation is only one part of whether recruitment has succeeded.

Describe relevant experience before demographics

Begin with what people need to have done, attempted or encountered. For an illustrative study of software purchasing, a job title may be less informative than whether someone recently evaluated suppliers, approved spending or implemented the chosen tool. Each role offers a different view of the decision.

Use demographics where they help answer the research question, and include relevant differences in access needs, confidence or circumstances. The Home Office’s participant-recruitment guidance provides a practical starting point for connecting recruitment to the people a service must support.

Separate essential criteria from desirable variation. An increasingly narrow wishlist can make recruitment difficult while quietly excluding ordinary users. If a criterion changes during recruitment, record why and consider what the change means for the study.

Choose a route that fits the audience

Existing customers can provide direct experience of a product, but they cannot stand in for everyone who might use it. People who abandoned the service, chose a competitor or never understood the offer may be absent from a customer list. Community organisations, specialist recruiters and participant panels can offer other routes, each with its own access limits and practical arrangements.

Ballpark’s participant panel is one recruitment option. Keep the choice of channel separate from the claim that a sample is representative: a large pool, detailed filters or demographic quotas do not by themselves establish representativeness.

A study intended to uncover usability problems and one intended to estimate population preferences need different sampling decisions. Recruiting more people does not repair a method that systematically misses the experience you need.

Make the invitation and screener work together

Explain the activity, time commitment, incentive and any recording requirements clearly enough for someone to decide whether to participate. Arrange accessibility support and give people a way to raise practical questions before the session.

A screener should establish eligibility without advertising the answers that qualify someone. Ask about specific experience and avoid collecting personal information simply because it might become useful later. GOV.UK’s recruitment guidance covers practical routes and arrangements for finding participants.

Incentives recognise people’s time and effort. They should not depend on praise, agreement or a successful task outcome. Informed consent also needs attention beyond recruitment: accepting an invitation should not leave someone surprised by what the study involves.

Check who actually took part

Compare the achieved sample with the plan, including cancellations, exclusions and any groups that were difficult to reach. In the software-purchasing example, a sample dominated by approvers may tell you little about the implementation work, even if every participant passed the screener.

Report those boundaries alongside the findings. A short account of who was recruited, through which channels and under what criteria gives colleagues a basis for judging how the evidence applies. It also makes the next round easier to plan because the team can see which experiences remain missing.