The authors wanted to see how showing the non-technical users the effect of a gesture before asking the user to perform the gesture. They took 1080 gestures from 20 participants and paired them with 27 commands performed with 1 and 2 hands. They found out that the users do not really care about the number of fingers they employ, 1 hand is preferred to two, desktop idioms strongly influence users' mental models, and there is a need for on screen widgets, since some commands are hard to come up with a common gesture. They use a Microsoft Surface prototype with a C# application to present recorded animations and speech.
Discussion
I think this is an interesting method of interaction. Although I don't know much about the Microsoft Surface, this looks promising. Also, I wonder how this study would look if they used children or people from other cultures.
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Jacob O. Wobbrock, Meredith Ringel Morris, ANdrew D. Wilson. User-Defined Gestures for Surface Computing. CHI 2009.
I wonder who would use a device like this, besides a casino or museum.
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