We performed a usability test on a mobile web app by using Ziggi-HD USB Camera to comfortably observe while the user completed the test. It worked great!
After doing usability tests for a year, this is the advice I would give my past self — prepare, practice, work with a pair, and above all, stay flexible.
Designers and developers each bring an important perspective, and the more we can empathize and collaborate with one another, the more value we can create.