Get Real! Planning Tasks and Activities for Your Usability Test
http://www.stc.org/confproceed/1995/PDFs/PG280281.PDF

Grice, Roger A.
STC Proceedings
1995

Abstract:

Producing usable task-oriented information requires thorough knowledge and understanding of the tasks to be supported. Technical communicators can acquire this knowledge and understanding in a number of ways, each of which has its own strong points and drawbacks.