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See security control and privacy control.
NIST SP 800-37 Rev. 2 under control
measure that is modifying risk. (Note: controls include any process, policy, device, practice, or other actions which modify risk.)
NISTIR 8053 under control
The means of managing risk, including policies, procedures, guidelines, practices, or organizational structures, which can be of an administrative, technical, management, or legal nature. An attribute assigned to an asset t hat reflects its relative importance or necessity in acheiving or contributing to the achievement of stated goals.
NIST SP 800-160 Vol.2 under control