What is a C3PAO, and when do you need one?

If your organization is preparing for CMMC Level 2 certification, at some point you may need a C3PAO. A C3PAO, or Certified Third-Party Assessment Organization, is an organization authorized to conduct CMMC certification assessments. Its job is not to prepare your organization for CMMC. Its job is to independently determine whether your organization meets the applicable CMMC requirements. That distinction is important.

What does a C3PAO actually do?

During a CMMC Level 2 certification assessment, the C3PAO evaluates whether your organization has implemented the required security practices (in CMMC, this is specifically outlined in NIST 800-171 rev2), and whether those practices are operating as described.

The assessment is evidence-based. Assessors do not simply review policies and accept written statements that a requirement has been implemented. They examine documentation and technical evidence, interview personnel, and observe or test how security practices operate within the environment.

For example, if your System Security Plan says accounts are disabled when employees leave the organization, an assessor may review the procedure, interview the person responsible for offboarding, and examine evidence showing that the process is actually being followed. The objective is to establish that what is documented, what your personnel describe, and what your systems demonstrate are consistent.

A C3PAO is not your readiness consultant

This is one of the most important distinctions to understand before beginning the CMMC process. A readiness consultant helps you prepare. They may identify gaps, recommend solutions, help configure systems, develop policies and procedures, organize evidence, and prepare employees for an assessment.

A C3PAO performs a different role. The C3PAO independently evaluates the environment you have already implemented. During the certification assessment, the assessment team cannot become your consultant. If a requirement is not met, the assessor cannot redesign the control or implement the solution for you and then evaluate that same work.

The independence of the assessment is intentional. The Department needs confidence that a certification decision is based on an objective evaluation rather than the opinion of the organization that designed the security program.

What happens during a CMMC Level 2 assessment?

Before the assessment begins, the C3PAO works with your organization to establish the assessment scope and understand the environment that will be evaluated. The assessment team then evaluates the applicable CMMC Level 2 requirements using the assessment methods established for the program. Depending on the requirement, that can involve:

• Examining policies, procedures, configurations, logs, screenshots, reports, and other evidence
• Interviewing employees, administrators, security personnel, and organizational leadership
• Testing or observing technical and operational processes
• Comparing your System Security Plan and other documentation with the environment that actually exists
• Recording assessment results and determining whether requirements have been satisfied

The process is considerably more detailed than submitting a questionnaire or providing a collection of screenshots. Your organization needs to be able to demonstrate that its security practices are implemented and operating.

When do you need a C3PAO?

Not every organization handling CUI will necessarily have the same CMMC assessment requirement. Your contract with the Department of War or prime contractor determines what applies. For organizations required to obtain a CMMC Level 2 certification assessment, the assessment must be performed by an authorized C3PAO. Other organizations may be permitted to satisfy the applicable requirement through a Level 2 self-assessment. That is why the first step should always be understanding the information you handle and the requirements contained in your contract.

When should you contact a C3PAO?

You do not need to wait until every piece of evidence is perfectly organized before speaking with a C3PAO. In fact, contacting one earlier can help you understand scheduling, scope, logistics, and what to expect from the assessment process.

But there is an important difference between talking to a C3PAO and starting your certification assessment. You should not begin the formal assessment hoping the assessment team will identify everything you still need to fix. Before assessment, your organization should understand its CUI environment, have an accurate System Security Plan, have the applicable security requirements implemented, and be prepared to demonstrate those requirements with appropriate evidence. The assessment is the verification step, not the readiness project.

How should you choose a C3PAO?

Do not choose an assessment organization based only on price or the first available assessment date. You are selecting the organization that will independently evaluate your cybersecurity program, so ask how the assessment will actually be conducted.

Find out who will lead your assessment, how experienced the assessment team is, how the C3PAO handles scoping and evidence, what the assessment schedule looks like, and how communication is managed before and during the assessment. You should also understand whether the organization provides CMMC consulting or readiness services and how it maintains the independence required of an assessor. A good C3PAO should be able to explain its process clearly before you sign an assessment agreement.

Readiness first. Assessment second.

The cleanest approach to CMMC is straightforward. Use your internal team, MSP, MSSP, or CMMC readiness consultant to build and validate your environment. Resolve known gaps. Make sure your documentation reflects what is actually happening. Organize the evidence you will need to demonstrate implementation. Then bring in the C3PAO to independently assess it. Those are different jobs, and keeping them separate protects the integrity of your certification.