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Verification and validation (V&V) performed by an organization that is technically, managerially, and financially independent of the development organization.
NIST SP 800-160 Vol. 1 under independent verification and validation from
A comprehensive review, analysis, and testing, (software and/or hardware) performed by an objective third party to confirm (i.e., verify) that the requirements are correctly defined, and to confirm (i.e., validate) that the system correctly implements the required functionality and security requirements.
NIST SP 800-37 Rev. 2 under independent verification and validation