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The design of multitouch multiuser tabletop user interfaces is still in its infancy and is not yet well understood. To date, published experimental results have primarily focused on controlled user studies. In this paper, we present observations of user experience "in the wild" on interactive tables in four different real world contexts - all noncontrolled settings. We reflect upon our collective experience, report our observations, and summarize lessons learned by identifying design considerations relating to several aspects of interactive tables, such as simultaneous touching, ambiguous input, one-fingered touch, finger resolution, alternate touch input, crowding and clutter, text input, orientation, multiuser coordination, occlusion, ergonomic issues, and mental models.
Ryall et al. (Wed,) studied this question.