Advanced Issues in Usability: Balancing User Preference and Performance Data Collection
http://www.stc.org/confproceed/1996/PDFs/PG288289.PDF

Rauch, Thyra L.
STC Proceedings
1996

Abstract:

The purpose of this paper is to provide a little background on my position for the progression on usability issues. I’ll present what measures I typically collect, and the differences between performance and preference data. Having this as a starting place may help us to have a useful progression discussion.