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In this paper we describe our methodology for building context-aware applications. It supports a systematic definition, conception and development of the context-aware features of an application along the different phases of a software development process. Its application has helped us in the discussion and conception of these features in project teams with non-technical domain experts. A context meta-model defines the common concepts and features of concrete context models, which are used in the transition between the different development phases. This context meta-model has been implemented in our context server MILEO. Thus it allows a model-based realization of an application's context logic without explicit programming. We describe how we have applied our methodology in the project `Daily Care Journal'.