Changing the Way the Profession Communicates: A Workshop for Prospective Journal Peer Reviewers 
More than 90% of Technical Communication readers are informed practitioners--writers, editors, illustrators, designers, trainers, and project managers. About 10% are teachers and students. They come from diverse backgrounds as well as from technical communication programs.
Hayhoe, George F. STC Orange County (1998). Articles>Rhetoric>Audience Analysis>Surveys