support function

A category of organizational or system-level duties — such as configuration management, quality assurance, testing, system administration, programming, and network security — that underpin and enable mission or business operations without directly constituting that mission. In security and compliance frameworks (prominently NIST SP 800-53 and SP 800-171), the category is invoked specifically to distinguish infrastructure and administrative tasks from operational/mission tasks for purposes of separation-of-duties analysis: separation of duties includes dividing mission or business functions and support functions among different individuals or roles, conducting system support functions with different individuals, and ensuring that security personnel who administer access control functions do not also administer audit functions. The field uses it as a practical grouping that identifies which roles hold technical power over a system's underpinnings — and therefore which role combinations must be kept separate to prevent privilege abuse or collusion.

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