Usability Laboratories: A 1994 Survey
http://www.useit.com/papers/uselabs.html

Nielsen, Jakob
Alertbox
1994

Abstract:

This article provides a table with summary statistics for the thirteen usability laboratories described in the papers in this special issue. It also gives an introduction to the main uses of usability laboratories in usability engineering and surveys some of the issues related to practical use of user testing and CAUSE tools for computer-aided usability engineering.