In earlier research, Tom Landauer and I showed that the number of usability problems found in a usability test with n users is: ![]() The best results come from testing no more than 5 users and running as many small tests as you can afford. Elaborate usability tests are a waste of resources. Some people think that usability is very costly and complex and that user tests should be reserved for the rare web design project with a huge budget and a lavish time schedule.
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