User Testing: Does Your Site Need It?
http://www.hansoninc.com/AboutUs/UserTesting.aspx

Osswald, Mike
Hanson
2001

Abstract:

So you’ve spent a lot of time with your content - editing it for brevity - bulletizing key points. Your graphics are sharp and have small file sizes. Your server is fast. You've submitted your site to key search engines. But how are your site's structure, navigation and overall usability? Do you really know?