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Separation of Concerns (SoC) is an architectural principle that divides systems into well-defined responsibility areas to improve maintainability and testability. It encourages loose coupling and high cohesion, enabling parallel development and reuse. Applied via modules, layers and explicit interfaces, it also simplifies refactoring.
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What organizes, connects, or makes decisions possible.
Separation of concerns structures a system so that different responsibilities can be handled and changed as independently as possible.
The idea was shaped in software engineering as a response to growing complexity and became known as separation of concerns through Edsger W. Dijkstra. Later architecture and modularization techniques applied it to components, layers, and domain responsibilities.
Look for different reasons to change. Group things that belong together for the same reason, and separate them where independent decisions, tests, or lifecycles emerge.
A concern groups related domain or technical decisions.
Coupling describes how strongly separated parts depend on one another.
High cohesion keeps things with a shared purpose together in a module.
Separation reduces side effects and makes software easier to understand, test, and change. It shapes module boundaries, layers, and team responsibilities.
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