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Failure to document or properly communicate which layers in the architecture are open and closed (and why) usually results in tightly coupled and brittle architectures that are very difficult to test, maintain, and deploy.

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Cover of Software Architecture Patterns

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Việc ko có document hoặc communicate rõ ràng layers nào trong layer architecture là open hay closed (và tại sao) sẽ dẫn tới kiến trúc tightly coupled and brittle --> rất khó để test, maintain và deploy