L

The share of a design's usability problems a single test user finds (31 percent on average in Nielsen and Landauer's projects, per the article).

By Mackenzie Bowes · mackenzie@mackenziebowes.com · @_mackenziebowes on X

Source

“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.” Why You Only Need to Test with 5 Users (Nielsen Norman Group)

See also: Usability problem.