Why You Only Need to Test with 5 Users
Summary: Elaborate usability tests are a waste of resources. The best results come from testing no more than 5 users and running as many small tests as you can afford. Introduction 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. Not true. Elaborate usability tests are a
Response Times: The 3 Important Limits Article by Jakob Nielsen
Summary: There are 3 main time limits (which are determined by human perceptual abilities) to keep in mind when optimizing web and application performance. Excerpt from Chapter 5 in my book Usability Engineering, from 1993: The basic advice regarding response times has been about the same for thirty years [Miller 1968; Card et al. 1991]: 0.1 second is about the limit for having the user feel that
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