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The key to universal usability is recognizing the diversity of user population and user needs.There is no "average" user on whom a system should be based.This experiment compared the performance of users with high and low spatial abilities on the old verbal interface and the new graphical interface.The graphical interface resulted in changes in command usage that were consistent with the predictions of the visual momentum analysis.To this end, design teams are urged to perform user and task analyses at the earliest stages of product development and to consider the nature of the users' cognitive and physical predispositions and abilities.These user characteristics are correctly seen as important in constraining the available design options and, if attended to, increasing the likelihood of producing a usable application.

That is, when a single design cannot accommodate a large fraction of the user population, multiple versions or adjustment controls should be available to users.

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Furthermore, in its evolution over the last 100 years, research on individual differences has faced many of the problems of theoretical status and applicability that is common to HCI.

In the present paper the relationship between work in cognitive and differential psychology and current analyses of users in HCI is examined.

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