Training & Education

what is controlled unclassified information

Training & Education

CUI 101: What Controlled Unclassified Information Really Is (and Why It Matters)

by Josh Manuel on Jan 21 2026
If you work with the Department of Defense (DoD) or support the Defense Industrial Base (DIB), you’ve almost certainly heard the term CUI—but it’s also one of the most misunderstood concepts in compliance. Understanding Controlled Unclassified Information (CUI) is foundational to DFARS, NIST SP 800-171, and CMMC compliance. This guide breaks it down clearly and practically.