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You might start with William Horton's book, Illustrating Computer Documentation,
1991, Wiley. He includes an extensive bibliography. You could also check with
Janice Redish (redish -at- quark -dot- umd -dot- edu), who has done much work on usability
testing. And, you could also check with Elizabeth Keyes (P.O. Box 400, Ashfield,
MA 01330-0400), who has done much work in perceptual psychology as it applies to
document design.
Mike Sharp
sharpmv -at- pccvax -dot- dnet -dot- dupont -dot- com