complex system

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Definitions:

A system in which there are non-trivial relationships between cause and effect: each effect may be due to multiple causes; each cause may contribute to multiple effects; causes and effects may be related as feedback loops, both positive and negative; and cause-effect chains are cyclic and highly entangled rather than linear and separable.
Sources:
NIST SP 800-160v1r1 from Systems Engineering and System Definitions

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See NISTIR 7298 Rev. 3 for additional details.