Usability testing - avoid leading your participants

Jakob Nielsen writes about avoiding telling your usability testing volunteers what to do, providing a few tips along the way.

Despite the article's title, he talks about accompanied surfing too.

I usually say user testing is easy: basically, you get some real customers and watch them use your site or app. But this article touches on one of the difficulties of running great studies: minimizing bias...

The beauty of usability is that the methods are so robust that they generate useful findings even if you use them wrong. This is particularly true for user testing: any time you watch customers, you'll learn something...

Card Sorting: Pushing Users Beyond Terminology Matches - Jakob Nielsen article