Krogh, Peter GallPetersen, Marianne Graves2017-04-152017-04-152008In this paper we introduce the concept of Collective Interaction. Collective Interaction involves designing for co-experiences among co-located people sharing collective resources for controlling interfaces. The particular approach we explore in this paper is to instrumentalize collaboration, such that the interaction itself is a matter of collective action. To illustrate this we provide an interaction model and a definition of Collective Interaction, and present two design cases based on this model, one in the context of a public library and one in a home-context. We outline design rationales, and discuss experiences from trial use of the prototypes.enCollective interactioninteraction designinteraction modelsocial computingco-located usersco-experienceText