How to Find and Recruit Research Participants

You can design the perfect interview guide and master every questioning technique, but if you're talking to the wrong people, none of it matters. Participant recruitment is the unglamorous foundation of good research — and it's where many studies go wrong.

This guide covers how to find the right people, screen them effectively, incentivize participation appropriately, and manage the logistics of scheduling.

Why Recruitment Matters More Than You Think

According to research from the User Experience Professionals Association, poor participant recruitment is the leading cause of unreliable findings in user research studies. When you interview people who don't have relevant experience, you get theoretical answers instead of grounded ones. When you recruit only from convenient sources, you get systematically biased data.

Good recruitment starts with a clear answer to one question: Who has recent, relevant experience with the topic I'm studying?

Defining Your Participant Criteria

Before you recruit anyone, define who you need to talk to. Your criteria should include:

Must-Have Criteria (Screeners)

These are non-negotiable. If a person doesn't meet these, they shouldn't be in your study.

• Relevant experience: They've actually done the thing you're studying (not just thought about it)
• Recency: Their experience is recent enough to recall in detail (typically within 3–6 months)
• Role/context match: They match the role, industry, company size, or context you're studying

Nice-to-Have Criteria (Diversity)

These help you build a participant set that captures a range of perspectives:

• Mix of experience levels (novice, intermediate, expert)
• Geographic diversity
• Different company sizes or industries
• Gender and age diversity

Disqualification Criteria

People you explicitly don't want:

• Competitors or people who work for competitors
• People in the UX/research industry (they'll give you "researcher answers" not real answers)
• People who have participated in a study for you within the past 6 months (to avoid professional participants)

Recruitment Channels

Where you recruit determines who you reach. Here's a comparison of the most common channels:

Recruiting from Your Existing Users

Your product's existing user base is often the fastest, cheapest, and most relevant recruitment source.

Email outreach: Send a brief, personal email to users who match your criteria. Response rates for well-targeted recruitment emails typically range from 10–25%.

In-product prompts: A small banner or modal inviting users to participate can generate a steady stream of volunteers. Be careful not to annoy people — make it easy to dismiss and don't show it too frequently.

With Koji, you can generate a shareable interview link and send it directly to your users — they can complete the interview on their own schedule, which dramatically reduces the coordination overhead of scheduling.

Recruiting from External Sources

When you need participants who aren't current users — for competitive research, new market exploration, or prospect studies — you'll need external channels.

Social media and communities: Post in relevant subreddits, Slack groups, Discord servers, LinkedIn groups, or industry forums. Be transparent about who you are and what the study is about. A study from the Journal of Medical Internet Research found that social media recruitment yielded more diverse participants than traditional methods for certain population segments.

Professional networks: LinkedIn outreach works well for B2B research. Personalize your messages, explain why you selected them specifically, and be clear about time commitment and incentives.

Recruitment panels: Services like UserTesting, Respondent, and Prolific maintain panels of pre-screened participants. They're expensive but fast, and they handle scheduling and incentives for you.

Writing Effective Screener Questions

A screener is a short survey that determines whether a potential participant meets your criteria. Good screeners are short (5–8 questions), clear, and hard to game.

Key principles:

• Don't telegraph the "right" answer. Instead of "Do you use project management software?" (obvious yes/no), ask "Which of the following tools do you use regularly?" with a list that includes project management tools alongside decoys.
• Verify recency. "When was the last time you [did relevant thing]?" with options like "Within the past month / 1–3 months / 3–6 months / More than 6 months / Never."
• Confirm the right role. "Which of the following best describes your primary responsibility?" with options.
• Include a disqualifier. "Do you or anyone in your household work in UX research, market research, or a related field?"

Setting the Right Incentive

Incentives show respect for participants' time and improve show-up rates. Research from Goritz (2006) in the Journal of the Market Research Society found that incentives significantly increase participation rates and reduce no-show rates in research studies.

Incentive Guidelines

Delivery methods: Digital gift cards (Amazon, Visa) are the most popular. Some participants prefer direct payment (PayPal, Venmo). Charitable donations in the participant's name are an option for corporate settings.

Timing: Send incentives within 24 hours of the session. Delayed payment erodes trust and makes future recruitment harder.

Managing No-Shows

No-shows are inevitable. A typical no-show rate for user research is 15–25%, even with confirmed participants and incentives.

Strategies to minimize no-shows:

• Send a confirmation email immediately after scheduling
• Send a reminder 24 hours before the session
• Send a final reminder 1 hour before
• Over-recruit by 20–25% (if you need 10 participants, recruit 12–13)
• Offer flexible scheduling options including evenings and weekends
• Make the commitment clear upfront (exact time, duration, what they'll be doing)

Scheduling at Scale

For studies with 10+ participants, scheduling logistics can become a significant bottleneck. The back-and-forth of finding mutually available times across multiple people can consume hours.

Asynchronous interview platforms like Koji eliminate this problem entirely — participants complete the interview when it's convenient for them, and you review responses on your schedule. This is particularly valuable for studies with larger sample sizes or geographically distributed participants.

Ethical Considerations

• Informed consent: Participants should understand what the study is about, how their data will be used, and that they can stop at any time.
• Anonymity and confidentiality: Be clear about whether responses will be attributed or anonymized.
• Vulnerable populations: If your research involves minors, patients, or other vulnerable groups, additional ethical review may be needed.
• Data storage: Explain how recordings and transcripts will be stored and who will have access.

Further Reading

• User Interview Guide — what to do once you have participants
• How Many Interviews Are Enough? — determine the right sample size
• Sharing Your Interview Link — distribute your Koji study to participants