The "magic number 5 (original) (raw)

CHI '03 extended abstracts on Human factors in computer systems - CHI '03, 2003

Abstract

ABSTRACT Common practice holds that 80% of usability findings are discovered after five participants. Recent findings from web testing indicate that a much larger number of participants is required to get results and that independent teams testing the same web-based product do not replicate results. How many users are enough for web testing?

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