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An interconnected set of information resources under the same direct management control that shares common functionality. It normally includes hardware, software, information, data, applications, communications, and people.
NIST SP 800-18 Rev. 1 under General Support System
NIST SP 800-60 Vol. 1 Rev. 1 under General Support System
NIST SP 800-60 Vol. 2 Rev. 1 under General Support System