Building Documentation Into the Interface: A Cognitive Theory
http://www.stc.org/confproceed/1997/PDFs/PG295-.PDF

Quesenbery, Whitney
STC Proceedings
1997

Abstract:

As documentation is more and more built directly into the interface, and as technical communicators move into areas of interface design and usability, it is important to have a theoretical framework within which to make decisions about what kind of information should be conveyed at any moment.