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Lack of context in information is a serious problem for knowledge-workers. Effective utilization of computational aids for supporting knowledge-workers require a rich understanding of the nature of context of information and related knowledge-works. It also needs specifications about how such understanding can be leveraged in computer-based systems. In this paper we propose a holistic model of context of knowledge-works and information created in course of their performances. We also demonstrate with an example how such a model can be used as basis for developing a formal, machine-deployable specification of activity context.