Not Just a Hammer: When and How to Employ Multiple Methods in Usability Programs
http://www.teced.com/PDFs/Upa2000-sr.pdf

Rosenbaum, Stephanie L.
Tec-Ed, Inc.
2002

Abstract:

Why should usability programs incorporate many kinds of methodology to influence corporate decision-making? This paper describes what makes successful multiple-method usability programs. It discusses when to apply each method and how to justify usability programs to management.