5 Users: Okay for Qual, Wrong for Quant

Summary: The recommended sample size (the number of study participants) is very different for qualitative user testing (small N) and for quantitative research (big N). Here's why the recommendations differ.

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5 Users: Okay for Qual, Wrong for Quant

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How Many Participants for Quantitative Usability Studies: A Summary of Sample-Size Recommendations

40 participants is an appropriate number for most quantitative studies, but there are cases where you can recruit fewer users.

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Raluca Budiu is Senior Director, Data Strategy, at Nielsen Norman Group, where she uses her data-analysis expertise to drive strategic decisions. She also serves as editor for the articles published on NNgroup.com. Raluca has coauthored many NN/g reports, as well as the book Mobile Usability. She holds a Ph.D. from Carnegie Mellon University.

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