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Evaluating the human interface of a data entry system: User choice and performance measures yield different trade-off functions.
MacLean, A., Barnard, P. & Wilson, M.
In P. Johnson & S. Cook (Eds.), Proceedings of HCI 5, People and Computers: Designing the Interface (pp.172-185). Cambridge: Cambridge University Press.
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When people use computer systems, they are often faced with alternative methods for carrying out a given task. They have to be able to judge which method is likely to be most appropriate for the particular task with which they are faced. A study is presented which compares the most common means of evaluation used in computer design, the time to carry out a given task, with the method the user actually chooses to carry out the task. The results suggest that users are not good at optimising their behaviour on the criterion used by designers.