Sparks of Innovation in Human-Computer Interaction, B. Shneiderman, Ed., Ablex Publ. (1993) 259-273.
Original and revised versions of the National Library of Medicine MicroAnatomy Visual Library system were evaluated with an empirical test of nineteen subjects. The versions of the program's interface differed on issues relating to consistency of wording and screen layout, use of color coding, display of status information, and availability of help information. Each subject used both versions of the program to perform matched sets of tasks. The dependent variables were time to perform tasks correctly and subjective satisfaction as reported via the QUIS questionnaire. The revised version was statistically significantly faster for five of twenty tasks and more satisfying to use on a number of dimensions. The benefits of consistency and guidelines for design of interactive computer systems are discussed.