This paper is one of a set of responses that will appear in the HCI Journal in 2001 to an Article by Dey, A. K., Salber, D., Abowd, G. D. (2001). A conceptual framework and a toolkit for supporting the rapid prototyping of context-aware applications
The development of context-aware applications will require tools that are based on clearly defined models of context and of system software architecture. This essay introduces models for each of these, examines the tradeoffs among the different alternatives, and describes a blackboard-based context architecture that is being used in the construction of interactive workspaces.