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M o b i l e I n f o r m a t i c s G r o u p , V i k t o r i a InstituteB o x 620, S E -4 0 5 30 G o t h e n b u r g , S w e d e n { d a h l b e r g , fredrik, s a n n e b l a d } @ v i k t o r i a . i n f o r m a t i c s . g u . s e ABSTRACT Proxy Lady is a mobile system for informal, opportunistic face-to-face communication, running on a PDA equipped with a radio transceiver. We describe the system and some preliminary evaluation results. KEYWORDSMobile computing, hand-held devices, CSCW. PROXY LADYIn this paper, we describe the design of a system called "Proxy Lady" that supports "opportunistic communication" in mobile work settings. Opportunistic interaction is anticipated by (at least) one party, but it only occurs when the parties happen to meet each other [1]. Proxy Lady assumes that "information items" like emails and tasks can serve as the basis for opportunistic interaction. The system lets the user associate information items (currently emails and tasks) with other people, called "candidates for interaction." When a "candidate for interaction" is in the proximity, Proxy Lady notifies and provides the user with the information item. If suitable, an informal communication session may follow. Figure 1 shows the mobile client.

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This paper reports from a project, called NewsPilot, where we explore how context aware computing can be used to support mobile collaborators. An empirical study of journalists at a local radio station in Sweden has informed the design of a prototype system. The system is built using a personal digital assistant (PDA) fitted with a radio transceiver and filters information based on the users physical location in relation to geographic places and other users.