Summary: Better to accept a wider margin of error in usability metrics than to spend the entire budget learning too few things with extreme precision.
Last week, I made a slide for the new User Experience (UX) Basic Training course with the recommended number of test users for different types of studies. I like teaching foundational courses because they afford me just this kind of opportunity — to distill 25 years of usability process research into a single table. Patterns crystallize when complex topics are condensed to the essence. Read more »









