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The paper presents the Development Environment for Coordinated Concurrent Activities (DECCA), a system incorporating a methodology and toolkit for developing concurrent, coordinating systems in a high-level, component oriented, reusable manner. A unique feature of DECCA is that it provides a Java API that enables behavior descriptions to be made using Java's conventional and OOP features, thus facilitating great flexibility in the description without compromising the methodology's high level features and component oriented nature. The paper presents the salient features of the DECCA methodology and infrastructure through illustrative examples. The difficulty in obtaining component based, reusable descriptions in the absence of such a methodology is also described. Finally, a comparison of DECCA with similar systems is presented.