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Principled approaches to the design of user interfaces are typically unsubstantiated by practical experience, or are validated only through laboratory experiments with toy programs. This experiment applies several theoretically motivated approaches to the user interface of an existing, practical program of moderate complexity; these approaches include conceptual models, task based design, the use of metaphor, direct manipulation, and empirical evaluation. Although necessarily informal, the experiment yields insight into the utility of these approaches, as well as observations on more general themes such as specialization versus generality, multiple models and their limits, the problem of context, and the elusiveness of consistency as a design goal.

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