Guide
What is an SSP?
A System Security Plan describes your system and how each control is implemented. Here is what belongs in it and how to keep it current.
Intermediate
10 min
Free
NIST SP 800-171
CMMC
Published · v1.0.0 · 2026-08-01
Template
SSP Outline
A section-by-section outline for a System Security Plan a small business can maintain.
- Intended audience
- Contractors preparing an assessment
- Difficulty
- Advanced
- Estimated time
- 60 minutes
- Access
- Premium plans
NIST SP 800-171
CMMC
FedRAMP
Government contracting
Version v1.0.0 · Last reviewed 2026-08-01 · Document owner: ComplianceAnvil Content Team
What you will be able to do
- Structure a System Security Plan with a clear system boundary and description.
- Identify the CUI categories and data types your system handles.
- Write control implementation narratives that describe what is configured, by whom, and how often.
- Document assumptions, exclusions, and inherited controls explicitly.
Outline
- System name, identifier, and owner.
- System purpose and description.
- System boundary and diagram.
- Data types handled, including CUI categories.
- Users, roles, and privileges.
- Connected systems and external services.
- Control implementation narratives.
- Assumptions, exclusions, and inherited controls.
- Plan maintenance, approval, and review history.
Writing narratives
Describe what is configured and who does it, not what the requirement says. Name the tool and the frequency.
Key takeaways
- A System Security Plan needs a clearly drawn system boundary and diagram before control narratives make sense.
- Control implementation narratives should describe what is actually configured and who maintains it, not restate the requirement text.
- Naming the specific tool and frequency in a narrative is what distinguishes a credible SSP from a generic one.
- Assumptions, exclusions, and inherited controls must be stated explicitly so an assessor knows what the organization is and is not responsible for.
- An SSP requires ongoing maintenance and an approval history, not a one-time write-up.
Sources
Written from these public, authoritative publications. ComplianceAnvil paraphrases and summarizes them; it does not reproduce copyrighted control text.
NIST · Revision 3
SP 800-171, Protecting Controlled Unclassified Information in Nonfederal Systems(opens in a new tab)Link last confirmed 2026-02-01
NIST · Revision 3
SP 800-171A, Assessing Security Requirements for Controlled Unclassified Information(opens in a new tab)Link last confirmed 2026-02-01
DoD Chief Information Officer
Cybersecurity Maturity Model Certification (CMMC) Program(opens in a new tab)Link last confirmed 2026-02-01
How this was written and reviewed
Published
- Author
- ComplianceAnvil Editorial Team
- Technical reviewer
- ComplianceAnvil Technical Review Board
- Jurisdiction
- United States (federal acquisition / DoD supply chain)
- First published
- 2026-08-01
- Last reviewed
- 2026-08-01
- Next review due
- 2027-08-01
Version v1.0.0 · Document owner: ComplianceAnvil Content Team
Important
This template is provided for readiness and educational purposes. Organizations should review and adapt it for their environment.
Related resources
Matched on shared frameworks, topics, and program packs.
Exercise
Build a Sample SSP Section
Draft one System Security Plan section end to end, using the narrative pattern assessors expect.
Advanced
25 min
Free
NIST SP 800-171
CMMC
Published · v1.0.0 · 2026-08-01
Guide
What is a POA&M?
A Plan of Action and Milestones is how you honestly track gaps. Done well, it builds trust; done badly, it destroys it.
Beginner
8 min
Free
NIST SP 800-171
CMMC
Published · v1.0.0 · 2026-08-01
Template
POA&M Starter
A plan of action and milestones you can actually maintain, with the fields assessors expect.
Intermediate
30 min
Free
NIST SP 800-171
CMMC
Published · v1.0.0 · 2026-08-01
Guide
What is a System Boundary?
Your boundary decides how much compliance work you have. Learn how to draw one that is defensible and small.
Intermediate
11 min
Free
NIST SP 800-171
CMMC
Published · v1.0.0 · 2026-08-01
Checklist
CMMC Readiness Checklist
Work through the preparation steps most small contractors miss before a CMMC assessment: scope, system boundary, documentation, and evidence.
Intermediate
45 min
Free
CMMC
NIST SP 800-171
Published · v1.0.0 · 2026-08-01
Put this into practice
Resources tell you what good looks like. A Program Pack does the work with you — generated documentation, tracked controls, training, and evidence in one workspace.