Reference table
Usability testing methods by sample size and time
A comparison of five usability testing methods: moderated remote, unmoderated remote, AI-moderated voice, in-person and guerrilla or hallway testing. For each one it lists when it fits, a typical number of participants and how long a round usually takes. Use it to plan a test before you recruit anyone.
Where this appears
What's in this reference table
| Method | When to use | Typical sample | Time |
|---|---|---|---|
| Moderated remote | Ambiguous flows, early concepts, complex enterprise UX | 5 to 8 | 2 to 3 weeks |
| Unmoderated remote | Validated flows, A/B variants, broad demographic coverage | 15 to 30 | 3 to 7 days |
| AI-moderated (voice) | Both of the above, plus scale and 24/7 availability | 20 to 100+ | 1 to 5 days |
| In-person | Hardware, physical environments, accessibility studies | 5 to 12 | 2 to 4 weeks |
| Guerrilla or hallway | Quick directional check on a single screen | 3 to 5 | Hours |
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<a href="https://www.koji.so/visuals/usability-testing-methods-sample-size-and-time"><img src="https://www.koji.so/visuals/usability-testing-methods-sample-size-and-time/usability-testing-methods-sample-size-and-time.png" alt="Table comparing five usability testing methods by when to use each, typical sample size and time, from moderated remote to hallway tests." width="1200" height="873" /></a>
<p>Source: <a href="https://www.koji.so/visuals/usability-testing-methods-sample-size-and-time">Usability testing methods by sample size and time</a>, Koji</p>
