The Conventional Wisdom
Most defense contractors approach CMMC as a project. You assemble a team, hire consultants, prepare documentation, pass the assessment, and move on. It becomes another line item on the compliance checklist, alongside ISO renewals and SOC 2 audits.
This project mentality seems logical. There's a clear deliverable (certification), a timeline (before your next contract bid), and measurable success criteria (C3PAO assessment result). Your organization probably handles most compliance work this way. So, why should CMMC be different?
Why CMMC Requires a Different Approach
CMMC isn't different because the controls are harder or the assessors are stricter. It's different because of what happens after certification.
Under 32 CFR Part 170, your C3PAO assessment occurs once every three years. That's a 36-month gap between formal validations. During that window, you're required to affirm your continued compliance annually in the Supplier Performance Risk System (SPRS). This isn't a courtesy update. It's a formal attestation to the DoD that the 110 NIST SP 800-171 controls remain implemented and effective across all 320 assessment objectives.
Think about what changes in your organization over three years. Infrastructure upgrades, personnel turnover, and shifting business priorities can all lead to "compliance drift," where your security posture diverges from your certified baseline.
The project approach fails here because projects end. You disband the team, reassign the budget, and redirect leadership attention. But your CMMC obligations don't pause. Control 3.12.1 explicitly requires ongoing internal assessments. Your System Security Plan must reflect current operations, not the snapshot from your last C3PAO visit. When you submit that annual SPRS affirmation, an Authorized Official is putting their name on a compliance claim that could trigger False Claims Act liability if it's inaccurate.
The Evidence of Drift
The three-year certification cycle creates a structural tension. Organizations treating CMMC as a project often show strong performance during the assessment, then experience measurable degradation in the 18 to 24 months that follow.
Consider scoping, a critical decision in CMMC preparation. Defensible scopes are driven by actual Controlled Unclassified Information (CUI) flow, technically enforced through segmentation, and aligned with operational reality. But scopes that made sense at certification can become obsolete when you win new contracts, migrate infrastructure, or onboard different collaboration tools.
If you've structured CMMC as a project, who's monitoring scope integrity between assessments? Who's validating that your CUI boundary enforcement hasn't eroded? Who's ensuring new hires understand which systems fall inside your CMMC environment?
The assessment phases themselves reveal this problem. Phase 1 planning requires current documentation. Phase 2 conditional assessment evaluates whether controls are actually implemented as described. Phase 4 remediation (when needed) gives you 180 days to close gaps. But none of these phases protect you from drift that occurs in month 20 of your certification cycle.
Organizations that embed CMMC into governance structures perform better at maintaining compliance between formal assessments. They've assigned clear control ownership across teams. They've built evidence management into normal operations. They've integrated CMMC scope decisions into their change management process. They haven't just passed an assessment; they've changed how they operate.
What to Do Instead
Integrate CMMC into your existing governance framework rather than managing it as a standalone initiative.
Start with executive leadership. CMMC compliance isn't an IT problem or a contracts problem. It's an operational risk that affects contract eligibility and creates potential legal exposure under DFARS 252.204-7012. Leadership involvement ensures organizational prioritization and resource allocation beyond the initial certification push.
Assign permanent control ownership. Every control family in NIST SP 800-171 should have a responsible subject matter expert who understands both the control intent and your implementation. These aren't temporary project roles. They're ongoing responsibilities that persist through your three-year cycle.
Build compliance monitoring into your regular cadence. Don't wait for the annual SPRS affirmation deadline to verify control effectiveness. Schedule quarterly reviews of high-risk control families. Conduct targeted assessments after significant system changes. Treat your Self-Assessment requirement (3.12.1) as a continuous activity, not an annual event.
Revisit scoping decisions when your business changes. If you're adding new CUI workflows, expanding your subcontractor base, or deploying new infrastructure, evaluate the scope impact before implementation. "Convenience-based" scoping decisions (like including everything to avoid boundary enforcement) create unnecessary assessment burden. But scope boundaries that don't reflect actual CUI flow create compliance gaps.
Maintain documentation alignment with operational reality. Your System Security Plan, policies, and procedures should describe how you actually work, not how you worked when the C3PAO visited. When processes change, update the documentation in real time. Waiting until pre-assessment preparation to "refresh" documentation is a symptom of project thinking.
Consider independent advisory support for your annual internal reviews. Many organizations engage their Registered Practitioner Organization to conduct structured gap assessments between C3PAO cycles. This provides the Authorized Official with confidence before submitting SPRS affirmations and identifies drift before it becomes material non-compliance.
When the Project Approach Works
The project approach isn't wrong for initial CMMC preparation. When you're starting from zero, you need a defined initiative with clear deliverables, dedicated resources, and project management discipline.
Gap assessments, remediation planning, documentation development, and pre-assessment readiness reviews all benefit from structured project execution. You're building something new, and project methodology provides the framework to get it done.
The mistake is assuming that project completion equals compliance achievement. Passing your C3PAO assessment means you've met the requirements at a point in time. Maintaining certification means you'll continue meeting them for the next 36 months, through infrastructure changes, personnel turnover, and shifting business priorities.
If your organization genuinely operates in a static environment with minimal change, minimal CUI exposure, and exceptional documentation discipline, the project approach might suffice. But most defense contractors don't work in static environments. Your business evolves, your contracts change, and your CMMC program needs to evolve with them.
Treat certification as the beginning of your compliance program, not the end.
