TYPIST - A THEORY OF PERFORMANCE IN SKILLED TYPING

TYPIST is a TheorY of Performance In Skilled Typing built within the f ramework of the Model Human Processor (MHP; Card, Moran, & Newell, 198 3). As such, it can be used to make quantitative predictions of perfor mance on typing tasks and can be integrated with other MHP-based model s of performance. In this article, I present the theory and explain th e source of each theoretical assumption (MHP, typing task analysis, or empirical typing data). I then demonstrate different ways to use TYPI ST by applying it to six transcription typing tasks. Finally, I summar ize its application to many more typing tasks that display robust beha vioral phenomena identified by Salthouse (1986).