14COMPONENT COUPLING

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The next three principles deal with the relationships between components. Here again we will run into the tension between develop-ability and logical design. The forces that impinge upon the architecture of a component structure are technical, political, and volatile.

THE ACYCLIC DEPENDENCIES PRINCIPLE

Allow no cycles in the component dependency graph.

Have you ever worked all day, gotten some stuff working, and then gone home, only to arrive the next morning to find that your stuff no longer works? Why doesn’t it work? Because somebody stayed later than you and changed something you depend on! I call this “the morning after ...

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