Usability Testing as Prevention Not Cure

This is a good article by Jared Spool on the value of usability testing. He writes "Usability tests can't tell you everything you need to know to make every decision right. However, if you pay attention to all the clues, you can learn a tremendous amount." He talks about usability as a preventative measure, what can and can't be learned from usability testing, getting the right test subjects, designing the right tasks, and the value of proper analysis of the findings.

Read the article.