five users (the myth)

Terms from Statistics for HCI: Making Sense of Quantitative Data

Often it is said that five users are enough for usability testing. This had some truth in the particular original context of iterative software development, where only enough issues needed to be uncovered for the next cycle of re-development. However, it is certainly not sufficient for statistical purposes.

Defined on page 13

Used on pages 8, 13, 105

Also known as 5 users, five users are enough