mission function

A category of organizational activity comprising the substantive, operational work that an organization exists to perform — its core business or programmatic responsibilities — as distinguished from the technical and administrative activities (such as system management, configuration management, or auditing) that support those operations. In NIST SP 800-53 and NIST SP 800-171, it appears explicitly in the separation of duties control, which calls for "dividing mission functions and support functions among different individuals or roles" to reduce the potential for abuse of authorized privileges and the risk of malevolent activity without collusion. The phrase is compositional rather than a defined term of art: its meaning is fully recoverable from its parts ("mission" = the organization's core purpose; "functions" = the activities that serve it), and it carries no specialized technical meaning beyond that ordinary composition.

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