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There is a growing realization that computer systems will need to be increasingly sensitive to their context. Traditionally, hardware and software were conceptualized as input/output systems: systems that took input, explicitly given to them by a human, and acted upon that input alone to produce an explicit output. Now, this view is seen as being too restrictive. Smart computers, intelligent agent software, and digital devices of the future will have to operate on data that are not explicitly given to them, data that they observe or gather for themselves. These operations may be dependent on time, place, weather, user preferences, or the history of interaction. In other words, context. But what, exactly, is context? We look at perspectives from software agents, sensors, and embedded devices, and also contrast traditional mathematical and formal approaches. We see how each treats the problem of context and discuss the …