The Myth of Usability Testing
http://www.alistapart.com/articles/the-myth-of-usability-testing/

Hoekman, Robert, Jr.
List Apart, A
2009

Abstract:

Usability evaluations are good for many things, but determining a team's priorities is not one of them. The Molich experiment proves a single usability team can't discover all or even most major problems on a site. But usability testing does have value as a shock treatment, trust builder, and part of a triangulation process. Test for the right reasons and achieve a positive outcome.