The RELATE interaction model is designed to support spontaneous interaction of mobile users with devices and services in their environment. The model is based on spatial references that capture the spatial relationship of a user's device with other co-located devices. Spatial references are obtained by relative position sensing and integrated in the mobile user interface to spatially visualize the arrangement of discovered devices, and to provide direct access for interaction across devices. In this paper we discuss two prototype systems demonstrating the utility of the model in collaborative and mobile settings, and present a study on usability of spatial list and map representations for device selection.Spontaneous interaction, spatial user interface, relative positioning.
Knowledge sharing is important in every team or organization. Various tools are frequently used in meetings to support knowledge sharing, ranging from pen-and-paper to whiteboards and other shared workspaces. This paper reports on a user study that investigated how private and shared displays affect knowledge sharing processes in colocated meetings. Three setups were compared in a hiddenprofile experiment: a distributed system providing a shared display and laptops (Note&Share), a regular whiteboard and pen-and-paper. The results show several advantages of the distributed system. For example, the group was more confident in the solution when using Note&Share. Furthermore the number of shared arguments was significantly closer to the correct number, which suggests that misunderstandings occurred less frequently. Finally some interesting effects were observed, which we claim to be connected to the availability of pen-and-paper in all conditions. Therefore, we discuss the observed effects as well as general lessons learned from this experiment.
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