A key skill you need for usability testing is the ability to work well with a variety of different types of people. You meet all kinds of people as usability testing participants. Over time, you get used to adjusting your approach to different personalities and characteristics. Most people are easy to deal with. However, some people present challenges.
In my latest UXmatters article, “Wrangling Difficult Usability Testing Participants,” I discuss ten types of challenging participants and how to best adjust your interaction with them to get the best testing experience.