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Why you only need to test with five users
- JacobAldridge 17y agoBetter still, make sure those five users are all familiar with the product, use exactly the same IT set-up, and are so alike in socio-economic and personal history terms that they could probably swap girlfriends without the girls really noticing much.
- harrybr 17y agoExactly - users aren't homogeneous. Neither are UIs - which are often meant to be used by different types of user group. You'll notice the author massively caveats his article near the end, stating "The best strategy is to bring in some set of users, find the problems they have, fix those problems, then bring in another set of users as part of an iterative design and test strategy. In the end, although you're never testing more than 5 users at a time, in total you might test 15 or 20 users."
- cubicle67 17y agoThe assumption here seems to be that each user will be using the application in a random manner, deciding which link to click much like tossing a coin. What's more likely to happen is that all 5 users follow almost the exact same path.