ACM Interactions

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Choose One: Fast, Correct or Pleasurable I work at a research institute populated by mathematicians and computer scientists. When mathematicians ask me what usability is I reply: A maximum of the function t S Ut, where t is a task and Ut= f1(Ct) + f2(St) + f3(Pt) where Ct is the correctness with which you carry out task t, St is the speed you do it, and Pt the pleasure you get in doing it; the functions f1...3 allow you to assign weights to the factors: for instance for a game, satisfaction is the most important factor, and speed…

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