90% of all usability testing is useless

90% of all usability testing is useless

Usability testing generally involves measuring how well test subjects respond in four areas: time, accuracy, recall, and emotional response. The results of the first test can be treated as a baseline or control measurement; all subsequent tests can then be compared to the baseline to indicate improvement.
Wiki/Usability

"Overly simplistic usability testing can produce too many issues, most of which will not have any desirable effect on the goals of the organization."
-Dirk Knemeyer | With infoDesign interview

90% of all usability testing performed on Web sites is useless. This is not to say that it doesn’t have a significant role to play in user experience design. When done right, usability testing will improve your Web site and your development process, but the current culture surrounding Web site usability testing is such that it rarely benefits the design.
Lane Becker | Adaptive path