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How many participants do you need? Teams either recruit too few people, producing unreliable findings, or too many, wasting time and money. The answer depends on your research method and what you're testing.

https://dnsk.work/blog/ux-iceberg-problem-research-excuse


<h2>Sample Size for Usability Testing</h2>


Usability testing aims to identify problems, not estimate prevalence across a population. Five to eight participants in a usability test typically reveal 70 to 80 percent of major usability issues. Testing a ninth person shows diminishing returns; they encounter problems the first five already found. This assumes you're testing a working prototype and looking for showstoppers. Testing more participants makes sense if you're exploring edge cases or testing with highly specialised user groups.


<h2>Sample Size for Surveys</h2>


Surveys aim to estimate prevalence and measure trends across populations. A survey