What Goes In a CMMC System Security Plan That Survives a C3PAO Review
The CMMC SSP that survives a C3PAO review is an objective-level document, paired with an evidence matrix that points the assessor to the relevant artifacts for each of the ~320 NIST SP 800-171A objectives. NIST SP 800-171 sets the floor; 32 CFR and the CMMC Assessment Process v2.0 layer additional requirements on top. ESP/CSP documentation, the Customer Responsibility Matrix, and Pre-Assessment Form completeness. For a small contractor with a contained CUI scope, a defensible SSP can easily run up to 80 to 150 pages.