A Practical Path to CMMC and NIST 800-171
How to approach CMMC readiness without stalling the business or boiling the ocean.
For any company that touches controlled unclassified information, CMMC has moved from “someday” to “required to win the contract.” The framework sits on top of NIST 800-171, which means 110 controls across 14 families. Seen all at once it is overwhelming. Approached in the right order it is just a program.
Scope before you spend
The single biggest lever is scope. The fewer systems that touch CUI, the fewer systems fall under assessment. Before buying a single tool, draw the boundary: which people, devices, apps, and network segments actually handle the data. Everything you can pull out of scope is effort you never have to spend.
Map controls to what you already have
Most organizations already satisfy more controls than they realize. Identity and MFA, endpoint management, logging, and encryption often exist; they are just not documented or enforced consistently. Start by mapping the 110 controls to your current stack and marking each one met, partial, or gap. The partials are usually faster to close than the gaps.
Documentation is half the score
A control that is implemented but not documented does not count in an assessment. Two artifacts carry most of the weight:
- The System Security Plan (SSP), describing how each control is met.
- The Plan of Action and Milestones (POA&M), tracking the gaps and their fix dates.
Build these as living documents from day one, not as a scramble the month before the assessor arrives.
Sequence the work
Close the cheap, high-impact gaps first: MFA everywhere, consistent endpoint enrollment, centralized logging, least-privilege access. Save the heavy lifts, such as network segmentation and full SIEM coverage, for when the foundation is solid.
CMMC readiness is not a product you buy. It is a posture you build and can prove. Treat it as a program with an owner, a scope, and a schedule, and it becomes one more thing that simply runs.