Low Budget Usability Testing Can Work
http://www.stcboston.org/archives/articles/usability3.shtml

Umbhua, Kurt
Boston Broadside
1991

Abstract:

With just a modest amount of equipment and effort, you can uncover some serious product glitches and potentially earn your company thousands of dollars and a sterling reputation. The first step is to get a video camera, a product prototype, and a small sample of your target audience.