Writing Better Screening Questions: How to Recruit the Right Research Participants
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The quality of your product research depends on the quality of the people taking part.
Whether you're testing a mobile app, website, prototype or physical product, recruiting the right participants is one of the most important steps in the research process. Even the best-designed research study will produce poor insights if it's completed by the wrong audience.
A well-designed screener questionnaire helps identify participants who represent your target audience whilst filtering out those who don't.
Imagine you're testing a coffee machine. Who would provide more valuable feedback?
Someone who drinks coffee everyday or Someone who occasionally drinks coffee?
The answer is obvious (regular coffee drinkers).
This is why screening questions matter. They help ensure your research is based on feedback from people who genuinely represent your target audience
Below are five best practices to improve the quality of your participant screening questionnaire.
1. Avoid Revealing the Qualification Criteria
When writing screening questions, it's important not to make the qualifying criteria obvious. If participants can easily work out who you're looking for, some may change their answers to qualify, if there's an incentive involved.
For example, instead of asking:
❌Do you own a dog? Yes / No
ask this:
✅ Which of pets do you currently own?
This question helps you identify dog owners without revealing you’re looking for them.
2. Ask Questions That Reveal Participant Behaviour
People's behaviour is often a better predictor than their opinions.
Ask participants about specific actions taken rather than general habits.
For example:
❌ Do you shop online regularly?
This is subjective. For one person, “regularly” might mean once a month. For another, it could mean every day.
Instead, ask:
✅ Approximately how many online purchases have you made in the last 30 days?
This helps you understand real user behaviour.
The same technique can be used for almost any type of product.
For a food delivery app:
❌ Do you order takeaway?
✅ How many takeaway meals have you ordered in the last month?
For an AI productivity tool:
❌ Do you use AI at work?
✅ Which AI tools have you used in the last 30 days?
Behaviour-based questions improve the quality of participants recruited.
3. Keep your screener questions Unbiased
Good screening questions should never hint at the "correct" answer. Leading questions encourage biased responses, producing lower quality research insights.
For example:
❌ Do you think electric vehicles are better for the environment?
This ‘leads’ the participant into thinking electric vehicles are better.
Ask this, instead:
✅ What is your opinion of electric vehicles?
Very positive
Somewhat positive
Neutral
Somewhat negative
Very negative
I don’t know enough to say
Neutral wording reduces bias and produces honest responses.
4. Keep Your Screener Concise
If a question doesn't help determine whether someone is suitable for the study, consider removing it from the screener. You may ask the question later on.
Long questionnaires increase participant fatigue and often reduce completion rates. As a general guide:
Aim for around 3 to 5 screening questions where possible.
Only ask questions that help identify if someone meets your recruitment criteria.
Show participants only the questions that apply to them.
For example, if you're recruiting parents, only ask follow-up questions about children to participants who have children.
Keeps the questionnaire relevant to each participant, in order to create a better participant experience.
5. Test Your Screener Before Sending It Out to Participants
Just as you test a product before launch, you should also test your screening questionnaire before sending it to participants:
Review every question for clarity.
Check for spelling or grammatical errors.
Remove ambiguous or biased wording.
If possible, ask a colleague to sense-check the questionnaire and identify anything confusing.
A simple internal review can help you spot and rectify issues before sending the questionnaire to participants.
Screening Questions Matter!
A screening questionnaire is the foundation of finding quality research participants. The participants you recruit determine the quality of the feedback you receive, and that feedback influences product decisions.
By investing time in writing a good screener questionnaire, you'll recruit quality participants who genuinely represent your users, leading to building better products.
Need Help Recruiting Participants?
At ThinkDoodl, we help companies recruit participants for user research, usability testing, concept validation, surveys, interviews and product testing across a wide range of industries. Whether you're testing an app, website, prototype or physical product, we'd be happy to help you find the right participants!