The CMMC framework requires a direct and independent assessment against its specific practices. While an existing ISO 27001 certification indicates a mature information security management system and the underlying evidence may be reusable, it does not grant automatic credit or reciprocity for a CMMC assessment. The CMMC Assessment Process (CAP) mandates that assessors verify the implementation of each applicable CMMC practice according to DoD requirements. The Department of Defense (DoD) has not yet implemented a policy for non-duplication or reciprocity with other cybersecurity standards. Therefore, the Lead Assessor must inform the Organization Seeking Certification (OSC) that their ISO 27001 certification, while valuable, does not substitute for a formal CMMC assessment.

A. Deferring is incorrect because the current, established CMMC assessment process must be followed, which does not permit credit for other certifications.
B. This incorrectly implies that credit is possible. The assessor's role is to assess against CMMC practices, not to validate other certifications for reciprocity.
D. Granting credit based on another certification is explicitly not permitted; assessors must independently verify each CMMC practice against CMMC assessment objectives.

1. Department of Defense. (2023, December 26). Cybersecurity Maturity Model Certification (CMMC) Program (32 CFR Part 170). Federal Register, 88(246), 89121.

In Section § 170.23, "CMMC Program reciprocity," the proposed rule states, "The DoD is not implementing reciprocity with other cybersecurity standards or assessments at this time." This directly supports the answer that no credit can be given.

2. The Cyber AB. (2023). CMMC Assessment Process (CAP) for CMMC Level 2, Version 5.1.1.

Section 2.2, "Assessment Scope," details that the assessment scope is defined by the CMMC practices applicable to the assets processing, storing, or transmitting CUI. The document provides no mechanism for accepting other certifications as evidence of compliance, reinforcing that each practice must be assessed directly.

3. The Cyber AB. (2022). Cyber AB Code of Professional Conduct, Version 2.1.

Section 3.1, "Compliance with the Law," and Section 3.4, "Performance of Duties," require certified professionals to adhere to all rules and procedures established by the DoD and the Cyber AB. This includes following the prescribed assessment process (the CAP), which does not allow for granting credit based on other certifications.