Small vs. Big User Studies - What’s Best?

Summary: Jakob Nielsen answers an audience question about small and large usability studies. Which of these will improve your user interface design the most? (From the UX Conference in London.)

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Small vs. Big User Studies - What’s Best?

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The answer is 5, except when it's not. Most arguments for using more test participants are wrong, but some tests should be bigger and some smaller.

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Jakob Nielsen, Ph.D., is a retired principal and co-founder (with Dr. Donald A. Norman) of the Nielsen Norman Group. Jakob established the "discount usability engineering" movement for fast and cheap improvements of user interfaces and invented the heuristic evaluation method.

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