duties of individuals requiring separation

This is a compositional noun phrase, not a term of art. It names the organization-assigned set of job functions or roles that an organization has determined must not be held or exercised by the same individual — the input that AC-5 requires an organization to identify and document. In NIST SP 800-53 Rev. 5, control AC-5 directs organizations to "identify and document [Assignment: organization-defined duties of individuals requiring separation]" and then define system access authorizations to enforce that separation. The phrase is a parameter placeholder — the bracketed "Assignment:" syntax signals that each organization substitutes its own concrete list of role conflicts — rather than a defined concept with a fixed meaning independent of that substitution. The underlying principle it serves is that separation of duties addresses the potential for abuse of authorized privileges and reduces the risk of malevolent activity without collusion, achieved by dividing mission or business functions and support functions among different individuals or roles.

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