Abstract

As communications systems increasingly gather and propagate information about people�s reachability or �presence�, users need better tools to minimize undesired interruptions while allowing desired ones. We review the salient elements of presence and availability that people use when initiating face-to-face communication. We discuss problems with current strategies for managing one�s availability in telecommunication media. We describe a prototype system called Lilsys which passively collects availability cues gathered from users� actions and environment using ambient sensors and provides machine inferencing of unavailability. We discuss observations and design implications from deploying Lilsys.

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