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Sub-functions are the basic operations employed to provide the system services within each area of operations or line of business. The recommended information types provided in NIST SP 800-60 are established from the “business areas” and “lines of business” from OMB’s Business Reference Model (BRM) section of Federal Enterprise Architecture (FEA) Consolidated Reference Model Document Version 2.3
NIST SP 800-60 Vol. 1 Rev. 1
NIST SP 800-60 Vol. 2 Rev. 1