A Fundamental Mind Shift For Usability Testing
Mature organisations focus on proactive research instead of reactive research. 5 users is enough doesn’t apply here.
How Many Participants are Really Enough for Usability Studies?
[Sciencific read] There is a lot of discussion going on if 5 respondents is enough for a usability test or not. This scientific study discusses all arguments and sets up an experiments to find the optimal number of respondents.
Why you only need to test with five users (explained)
There is and has been a lot of debate about the magical number of five users for usability testing. Jeff explains the discussion from a statistical perspective.