Guys and Gals, I’d like you to go check out my friend Kavin’s blog on Usability Testing Metrics. I thought this was a great blog to keep in your arsenal just in case you forget what kind of information you’re trying to gather from Usability Testing.
Alternatively, if you wanna evaluate your interface yourself or gather some more useful data first then check out my bud Josh Sarver’s post on Cognitive Walkthrough, Streamlined Cognitive Walkthrough, and Focus Groups. This single post can give you an awesome rundown of each method.