Say it in Pictures: Visual Literacy for Business and Technical Communication
http://www.stc.org/confproceed/1998/PDFs/00159.PDF

Horton, William K. III
STC Proceedings
1998

Abstract:

Today’s communication media demand more than just words. Producing effective documents, training materials, and Web pages requires the ability to understand, think, and communicate graphically' to be visually literate.