In computer science, coupling or dependency is the degree to which each program module relies on each one of the other modules. Coupling is usually contrasted with cohesion. Low coupling often correlates with high cohesion, and vice versa. The software quality metrics of coupling and cohesion were invented by Larry Constantine, an original developer of Structured Design who was also an early proponent of these concepts (see also SSADM). Low coupling is often a sign of a well-structured computer system and a good design, and when combined with high cohesion, supports the general goals of high readability and maintainability.

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