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Harnessing the benefits of bimanual and multi-finger input for supporting grouping tasks on interactive tabletops

In this paper we describe an experimental study investigating the use of bimanual and multi-finger input for grouping items spatially on a tabletop interface. In a single-user setup, we compared two typical interaction techniques supporting this task. We studied the grouping and regrouping performance in general and the use of bimanual and multi-finger input in particular. Our results show that the traditional container concept may not be an adequate fit for interactive tabletops. Rather, we demonstrate that informal and organic spatial metaphors are able to harness more benefits of multi-finger and bimanual interaction. We conclude with recommendations for the design of grouping techniques on interactive surfaces.