Abstract
Usability of software should measure both user preference and user
performance. The notion of usability involves several dimensions.
These dimensions include: system feedback, consistency, error prevention,
performance/efficiency, user like/dislike, and error recovery. Each
of these dimensions are characterized by fuzzy aspects and linguistic
terms. This paper develops a model for each of the dimensions using
fuzzy-set theory. It then uses the Takagi-Sugeno fuzzy-inference
approach for developing an overall measure of usability. Results
are presented for several different user interfaces.
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