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How small the pieces are. When a system is split into components, it's important to get the right degree of componentization. Small, fine-grained components give much greater flexibility in assembling precisely the right combination of functionality, but they are more difficult to co-ordinate. Much larger, coarse-grained components are easier to manage but may become too unwieldy. Performance and management considerations tend to favor the use of more coarsely grained messages in a service oriented architecture, whereas earlier generations of distributed computing have preferred a much finer level of granularity.

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