Factors and Principles Affecting the Usability of Four E-commerce Sites
" This paper documents the results of the initial study in which sixteen participants used and compared two sites that sold clothing, and two sites that sold computer products. The primary purpose of this first study was to pinpoint factors that affect the usability of four e-commerce sites". (Mar-07-99)
The link address is: http://research.microsoft.com/users/marycz/hfweb98/tilson/index.htm