This paper is a study of gestures for multitouch display interaction. The gestures were user defined for 27 commands. In all, 1080 gestures were observed. The purpose of this paper is to "help designers create better gesture sets informed by user behavior." The resulting gesture set was completely user defined. It turned out that the combined gestures predicted by the authors only covered 43.5% of the final gesture set. The authors also found that "users rarely care about the number of fingers they employ, that one hand is preferred to two, that desktop
idioms strongly influence users’ mental models, and that some commands elicit little gestural agreement."
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This paper illustrates the necessity of user input when designing s system. Often, surprising results can be obtained by studying users in this way. This step is crucial when designing a new type of system in which little is known about the input or little input is formally defined.
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