User Experience Accountability: Assessing Your Impact on Business Results
http://www.adaptivepath.com/publications/essays/archives/000276.php

Hirsch, Scott
Adaptive Path
2003

Abstract:

So often, user-experience designers are held accountable for process objectives. A successful project is one that meets budgets, deadlines, and specifications. There's a problem with measuring success this way-process-objective metrics don't really tell you how good you are at developing a strong user experience, only whether you completed the job specifications efficiently.