Abstract
A critical problem for the advancement of our discipline is the lack of consensus about metrics for measuring the dimensions of usability. What matters to users and to those who want users to adopt a system or product is usability from the users' perspective, and what should matter to designers and researchers is the question of what influences that perspective. Solving this problem would add structure to research on user interface methodologies and new design techniques. It would allow the research to be integrated more effectively. It would provide a way for industry to assess when the benefits of applying the results from the lab are justified by the cost, and it would support the creation of more useful guidance for the practitioner on when to apply new methodologies and techniques.

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