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A subsystem that is not continually present during the execution phase of an information system. Service-oriented architectures and cloud computing architectures are examples of architectures that employ dynamic subsystems.
CNSSI 4009-2015 NIST SP 800-37 Rev. 1, NIST SP 800-53 Rev. 4
NIST SP 800-37 Rev. 1 under Dynamic Subsystem