CA.L2-3.12.3 · Level 2

Monitor security controls on an ongoing basis to ensure the continued effectiveness of the controls.

NIST SP 800-171 Rev 2 · §3.12.3

Assessment objectives

From NIST SP 800-171A · 1 objective must be met to satisfy this control

3.12.3[a] Monitor security controls on an ongoing basis to ensure the continued effectiveness of the controls.

Examine

[SELECT FROM: Security planning policy; organizational procedures addressing security plan development and implementation; procedures addressing security plan reviews and updates; enterprise architecture documentation; security plan; records of security plan reviews and updates; other relevant documents or records].

Interview

[SELECT FROM: Personnel with security planning and plan implementation responsibilities; personnel with information security responsibilities].

Test

[SELECT FROM: Organizational processes for security plan development, review, update, and approval; mechanisms supporting the security plan].

What we look for in practice

The following are placeholder notes that should be refined based on practice experience.

What assessors look for in practice. Documented evidence that this control is implemented across all CUI-handling systems within scope. Specific artifacts vary, but expect requests for written procedures, system configurations, and operational records demonstrating the control is active.

Common failure patterns. Typical issues include incomplete documentation, inconsistent implementation across systems, and missing periodic review records. Refine this section as your practice accumulates direct assessment experience.

Strong evidence looks like. Formal policy referencing this control, technical configurations demonstrating enforcement, periodic review logs with sign-off, and procedures for handling exceptions.

Scoring and POA&M context. 5-point control under the DoD Assessment Methodology. Highest scoring impact — treat as a foundational requirement. Not POA&M-eligible — must be implemented at assessment time.