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This paper introduces design fragments as a fundamental component of a design process for strong traceability in the design of concurrent systems. Design fragments represent reusable alternatives for the independent design of the communication requirements in a concurrent system. They are defined with formal relations to segments of communicating state machines, and are applied such that they satisfy the semantics of the communications defined by the specification. This paper introduces the concept of design fragments, the approach to developing and using them, along with an illustrative example.