Today we learned about a simple and a complex way of doing usability testing.
Simple: ask a human to perform some tasks on your product, observe them, identify what gives them trouble. You can also ask them some questions along the way.
Complex: you take various measures of usability such as time on task, time performance, efficiency, etc. The slides below remind you of the types of metrics and the overall flow of a usability test. I highly recommend Measuring the User Experience for more-in depth information about why and how to collect each metric, and how to analyze and report data for each one.