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Scaled worlds preserve certain functional relationships of a complex task environment while paring away others. The functional relationships preserved are defined by the questions of interest to the researcher. Different scaled worlds of the same task may preserve and pare away different functional relationships. In this paper we use the example of Ned to(More)
Knowledge of object locations in direct manipulation interfaces improves performance by restricting visual search. This paper explores the effects of label representativeness and practice on the learning of object locations. Results showed that as label representativeness decreased, location knowledge increased. All participants were shown to have learned(More)
How much time the user spends working on a task versus fiddling with the tool is an important aspect of usability. The concept of the ratio and distribution of tool-only operations to total operations is proposed to capture this aspect. INTRODUCTION Using a tool to perform a task ~quires the user to translate goals from a task space into subgoals and(More)
In the proposed work, research in cognitive science and display-based HCI is synthesized and brought to bear on the question of "what makes GUI good?". A two-phase approach is outlined. The empirical phase will build upon a foundation laid by display-based HCI research. The computational modeling phase will be informed by the empirical phase and previous(More)
A dynamic tension or an inevitable schism? [Review of the book Expertise and technology: Cognition and human-computer cooperation]. Contemporary Psychology, 41(6), 592-539. In their foreword, the editors give a nod toward the " internationally based human-computer interaction (HCI) community, at the level of research as well as at the level of application "(More)
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