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This paper is about a software architecture, named WCAM (watcher, controller, action, and model), which reduces the complexity of context-aware systems by decoupling of concerns. We first introduce general requirements of context-aware systems. Next, we present our architecture pattern, WCAM. Watcher perceives external environment, and controller manages the cooperation between watcher and model. Model gathers contextual information, interpret the information, and generate contexts for system. Action manages services that are related with contexts.