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Two or more systems that are able to transact without being connected, or coupled. The systems do not interact with each other, and also one system usually has only a very limited knowledge of any other system, and that knowledge is usually limited to information about shared interfaces. A decoupled system allows changes to be made to any one system without having an effect on any other system.

Also called uncoupled.
See also coupling, loose coupling, and tight coupling.

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