J. Coutaz, J. L. Crowley, S. Dobson, and D. Garlan. Context is key. Communications of the ACM, 48(3):49–53, March 2005. [url]

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This article offers a nice introduction to threating context as the key element of the development of every ubiquitous computational system. The authors point out that context can be seen in two different way: as a process (part of the problem-solving activity of the agent); or as a state.

The author also propose a conceptual framework for context-aware systems based on an ontological foundation that comprehend entities, roles, relations, and observables.