This document discusses different approaches to usability testing, including heuristic analysis, usability testing with user panels, focus groups, and eye tracking. Heuristic analysis involves experts reviewing a site based on recognized usability issues. Usability testing measures user performance on tasks without guidance. Focus groups involve moderated discussions with small groups of users. Eye tracking provides objective data on user eye movements that can complement traditional usability methods. The approaches vary in resources required, costs, and type of output generated.