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An attribute associated with an assessment method that addresses the rigor and level of detail associated with the application of the method. The values for the depth attribute, hierarchically from less depth to more depth, are basic, focused, and comprehensive.
CNSSI 4009-2015 NIST SP 800-137
NIST SP 800-137 under Depth NISTIR 7298
NIST SP 800-53A Rev. 4 under Depth