A screener helps a researcher recruit people whose experience is relevant to the question. It might establish whether someone recently arranged a delivery, manages permissions at work, or has tried to cancel a subscription. Its job is to assess fit for the study, rather than to find people likely to praise the product.
Nielsen Norman Group’s participant-screening guidance explains how question design affects recruitment. The criteria need to come from the research purpose before they are translated into a questionnaire.
Ask about the experience you need
For an illustrative study of business purchasing, a job title alone may not establish that someone chose or approved a tool. Ask what they did in a recent purchase, when it happened, and who else participated.
Use bounded questions that people can answer accurately. “Which of these activities have you done in the past three months?” can be more informative than “Are you an experienced buyer?” Include plausible options and avoid revealing the qualifying answer through wording such as “We need people who hate their current software”.
Keep necessary exclusions explicit in the research plan, but do not turn the screener into a guessing game. Contradictory or implausible answers merit review; a single unusual response is not automatically evidence of dishonesty.
Recruit for variation as well as eligibility
People can meet the same core criterion and still differ in ways that matter. A first-time purchaser and a regular procurement manager may encounter different difficulties. Define the variation the study needs and plan recruitment accordingly.
Avoid adding demographic quotas without a reason, or assuming that quotas make a sample fully representative. Sensitive questions need a clear purpose, appropriate wording, and careful data handling.
Ballpark’s screeners can support eligibility checks within recruitment. The tool implements the criteria; the researcher remains responsible for whether those criteria select the right experiences.
Check the screener before committing the sample
Pilot the wording and routing, including the paths for people who do not qualify. Make the time commitment and participation arrangements clear, and avoid collecting more personal information than the decision requires.
Review the resulting sample against the plan before sessions begin. If suitable people are being excluded or the recruitment pool is unexpectedly narrow, investigate the criteria rather than silently relaxing them. A short record of changes helps explain the sample in the final study and makes future recruitment more deliberate.