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The SOW details what the developer must do in the performance of the contract. Documentation developed under the contract, for example, is specified in the SOW. Security assurance requirements, which detail many aspects of the processes the developer follows and what evidence must be provided to assure the organization that the processes have been conducted correctly and completely, may also be specified in the SOW.
NIST SP 800-161 from NIST SP 800-64 Rev. 2
NISTIR 7622 under Statement of Work from NIST SP 800-64 Rev. 2