Data Flow Mapping for CMMC Level 2: Why Mapping CUI Flow Determines Your Entire Compliance Strategy
If you can’t see where Federal Contract Information (FCI) and Controlled Unclassified Information (CUI) travel in your workflows, you can’t scope your obligations—period. This data flow mapping guide gives you a clear, repeatable way to map data flows, define system boundaries, and stop misclassification before it derails your contract.
Executive Summary
- Controlling how CUI flows inside and outside your environment determines scope, architecture, tooling, and cost.
- Design a focused CUI enclave so requirements only follow where CUI actually goes, reducing complexity and spend.
- Document, enforce, and evidence approved flow paths to satisfy AC.L2-3.1.3 and pass a CMMC Level 2 assessment.
1. Introduction: Data Flow—the Most Underestimated Requirement
Organizations that pass CMMC Level 2 know exactly where CUI is allowed to go and can prove it never goes anywhere else. Information flow control is not just another checkbox—it shapes your boundary, controls, and cost.
2. What “Data Flow Control” Means in CMMC (AC.L2-3.1.3)
Control the flow of CUI in accordance with approved authorizations. Assessors expect to see:
- Defined information flow control policies;
- Defined enforcement mechanisms;
- Designated sources and destinations for CUI;
- Defined authorizations for CUI flow;
- Consistent enforcement of those authorizations.
