Evidence Collection Best Practices for CMMC
Assessors need evidence for every control they evaluate. Here's what types of evidence satisfy the examine, interview, and test methods — and how to organize it before your assessment.
CMMC assessors do not take your word for it. Every control determination must be supported by evidence. Preparing a strong evidence package before the assessment is one of the highest-leverage things you can do to accelerate your assessment.
| Method | Evidence types |
|---|---|
| Examine | Policies, procedures, SSP, network diagrams, configuration screenshots, training records, audit log exports, contracts with MSPs |
| Interview | Documented Q&A responses, personnel training certifications, role-based acknowledgments |
| Test | Live system demonstrations, vulnerability scan reports, penetration test results, configuration exports |
Evidence quality rules
- ✓Evidence must be dated — screenshots should include system date/timestamps
- ✓Evidence must be traceable to a specific system, user, or location in your boundary
- ✓Evidence must be consistent with your SSP
- ✓Evidence of recency matters — audit logs from six months ago may not satisfy a control that requires ongoing monitoring
Pre-assessment evidence package
Building an organized evidence package before the assessment begins gives assessors clear traceability from each NIST control to its evidence. Organize by control domain (AC, AT, AU, etc.) with a master index linking each control to its primary evidence files.
The most overlooked evidence gap
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