Activity-based computing: support for mobility and collaboration in ubiquitous computing

This paper presents the design philosophy of activity-based computing (ABC), which addresses mobility and cooperation in human work activities. Furthermore, it presents the ABC framework, which is a ubiquitous computing infrastructure supporting ABC. The idea of ABC and the aim of the ABC framework is to: ( 1) support human activity by managing its collection of work tasks on a computer, ( 2) support mobility by distributing activities across heterogeneous computing environments, ( 3) support asynchronous collaboration by allowing several people to participate in an activity, and ( 4) support synchronous, real-time collaboration by enabling "desktop conferencing'' by sharing the activity across several clients. During a period of two years, the ABC framework has been co-designed and evaluated in close cooperation with a range of clinicians in a hospital.