03.15.02 — (a) Develop a system security plan that: (b) Review and update the system security plan {{ insert: param, A.03.15.02.ODP.01 }}. (c) Protect the system security plan from unauthorized disclosure.

What this control requires

(a) Develop a system security plan that: (b) Review and update the system security plan {{ insert: param, A.03.15.02.ODP.01 }}. (c) Protect the system security plan from unauthorized disclosure.

Source: NIST SP 800-171 R3 §03.15.02 (official control text).

Why this matters

The System Security Plan (SSP) is the authoritative blueprint documenting how an organization protects CUI across its information systems. It maps every security control to specific implementations, identifies system boundaries, documents data flows, and establishes accountability for security measures. Without an SSP, auditors cannot verify compliance, staff cannot understand their security responsibilities, and the organization lacks a coherent strategy for protecting sensitive information. This document proves that security isn't accidental—it's engineered, documented, and maintained through deliberate processes.

What evidence assessors expect

Assessors typically look for: PDF, signed letter, screenshot. FORCE coaches you through the exact implementation steps and captures each artifact in-platform.