In many user-interface-design-oriented organizations and publications, we learn increasingly of a concern about issues that extend the reach of the profession beyond traditional human factors and usability, where usability is often summarized as a combination of effectiveness, efficiency, and satisfaction. I have in mind the substantive and rhetorical additions of usefulness and appealparticularly, achieving a pleasurable user experience. These objectives seem especially important for mobile device design, for which usability and product enjoyment are equally of concern. It is a charming twist of history that the classical architectural design ideals of commodity, firmness, and delight proposed by Vitruvius more…
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