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As computer systems grow in size and complexity, their integration, while a necessity, becomes more difficult. Service oriented architectures and middleware systems in general deal with the issue by decoupling the components. However, these architectures are still designed and enacted from a centralised perspective: a single process invokes remote services, unaware of being part of a larger, more complex workflow. The authors claim that the orchestration-based approach does not scale well with increasing complexity and heterogeneity of the components, such as those required in the enactment of medical guidelines and workflows.
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