Let the User Write the Documentation 
Teaching non-writers how to write can be challenging, especially when they are adults using new software to do their jobs. But who knows best how to write about their jobs than the end users. Through field experiences and case studies, this paper describes methods and approaches for eflectively including the end user in the documentation process, as well as educating experienced writers who are new to the system.
Doyle, Diane J. and Janet M. Samuelson. STC Proceedings (1997). Articles>Documentation>Education>Writing