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This chapter provides an overview of the area of service composition. It does so by introducing a generic architecture for service composition and using this architecture to discuss some salient concepts and techniques. The architecture is also used as a framework for providing a critical view into a number of languages, standardization efforts, and tools related to service composition emanating both from academia and industry and to classify them in terms of the concepts and techniques that they incorporate or support (for example, orchestration and dynamic service selection). Finally, the chapter discusses some trends in service-oriented software systems engineering pertaining to service composition.