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We analyze the role of the social group in a ubiquitous computing (Ubicomp) environment as a source of contextual information. A model is presented to address the social group member's perceptions of how devices in a ubicomp environment should aid them in collaboration. Based on the model a distributed context-aware group membership management scheme is developed. We then present a prototype implementation for a context-aware ephemeral group membership management scheme, along with a sample application, and experimental results that demonstrate the feasibility of our system.