# NIST SP 800-171 Rev. 3 3.16.1 — Security Engineering Principles - Source: https://support.icompaas.com/compliance/nist-sp-800-171-rev-3/3-16-1-security-engineering-principles - Section: [Compliance](https://support.icompaas.com/compliance) › [NIST SP 800-171 Rev. 3 Requirements](https://support.icompaas.com/compliance/nist-sp-800-171-rev-3) › System and Services Acquisition — §3.16 - Last updated: 2026-06-05 - Publisher: iCompaas, Inc. (https://www.icompaas.com) **NIST SP 800-171 Rev. 3**·Requirement `3.16.1`·high·Component: **Planning** ## What this control requires > This control requires applying systems security engineering principles to the development or modification of the system and its components. These principles help create secure, resilient, and trustworthy systems by establishing protections, security architectures, and controls, incorporating security requirements into the system development life cycle, and performing threat modeling to identify and mitigate risks. This control supports the Security Engineering Process capability within the Planning (3.16) family. > > — NIST SP 800-171 Rev. 3, Requirement 3.16.1 ### In plain English This control requires applying systems security engineering principles to the development or modification of the system and its components. In practice, this means you can prove you system management-level controls on a defined cadence. ## Why it matters DoD contractors and their subcontractors must implement all 100 SP 800-171 requirements to keep CUI handling contracts. Gaps are scored against the SPRS scoring methodology; below a 110-point starting score, each unmet requirement deducts points and a below-threshold score can disqualify a bid. This control is rated **high**. Auditors expect a named owner, a remediation SLA, and a tooling artefact that evidences continuous operation. ## What an auditor looks for A C3PAO conducting a CMMC Level 2 assessment uses NIST SP 800-171A objectives. They expect a System Security Plan (SSP), Plan of Action & Milestones (POA&M) for any gaps, and objective evidence (configurations, ticket records, training records) for every requirement. Within **Planning**, the assessor will trace your implementation back to the catalogue reference (Requirement 3.16.1) and look for objective evidence on the latest two assessment cycles. ## How to implement #### Policy Management **Docs.** Keep each policy in version-controlled Markdown alongside the code that implements it; ship a signed PDF snapshot at each annual review and link the SHA into the SoA. #### Secure Development **Pipeline.** Require code review, SAST (Semgrep / Snyk Code), SCA (Dependabot / Renovate), secret-scanning and IaC scanning in the merge pipeline. **Branch protection.** Protected branches enforce reviews, signed commits and passing CI before merge; document the protection rules as the control evidence. ### Operational checklist - **System.** Document the trigger, the owner and the cadence. - **Risk.** Document the trigger, the owner and the cadence. - **Security.** Document the trigger, the owner and the cadence. - **Policy.** Document the trigger, the owner and the cadence. - **Scope:** management, modification, security, development. ## Evidence to collect - **Policy Document.** A signed and version-controlled policy / standard / procedure document. Signed policy or standard documents the safeguard. Focus: Security Engineering Principles. ## Common pitfalls - Policies that no engineer has read; the version in Confluence drifts from the version that's actually being enforced. - CI security checks set to warn-only; the merge button is faster than the security feedback. ## How it maps to other frameworks Computed from shared tags, control component and key-operation subjects — handy when you are reconciling controls across an audit. - [**ISO/IEC 27001:2022 A.8.29** — Security testing in development and acceptance](https://support.icompaas.com/compliance/iso-27001-2022/a-8-29-security-testing-in-development-and-acceptance) - [**SOC 2 (2017 TSC) CC1.2** — Board Independence and Oversight](https://support.icompaas.com/compliance/soc-2-trust-services-criteria/cc1-2-board-independence-and-oversight) - [**NIST SP 800-53 Rev. 5 PL-2(3)** — Plan And Coordinate With Other Organizational Entities](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/pl-2-3-plan-and-coordinate-with-other-organizational-entities) - [**BSI C5:2020 DEV-01** — Policies for the development/procurement of information systems](https://support.icompaas.com/compliance/bsi-c5-2020/dev-01-policies-for-the-development-procurement-of-information-systems) - [**HIPAA (45 CFR Part 164) 164.308(a)(5)(i)** — Security Awareness and Training](https://support.icompaas.com/compliance/hipaa/164-308-a-5-i-security-awareness-and-training) ## Related controls in NIST SP 800-171 Rev. 3 - [**Requirement 3.13.2** — Recategorized as NCO](https://support.icompaas.com/compliance/nist-sp-800-171-rev-3/3-13-2-recategorized-as-nco) - [**Requirement 3.16.2** — Unsupported System Components](https://support.icompaas.com/compliance/nist-sp-800-171-rev-3/3-16-2-unsupported-system-components) - [**Requirement 3.4.1** — Baseline Configuration](https://support.icompaas.com/compliance/nist-sp-800-171-rev-3/3-4-1-baseline-configuration) - [**Requirement 3.12.1** — Security Assessment](https://support.icompaas.com/compliance/nist-sp-800-171-rev-3/3-12-1-security-assessment) - [**Requirement 3.17.3** — Supply Chain Requirements and Processes](https://support.icompaas.com/compliance/nist-sp-800-171-rev-3/3-17-3-supply-chain-requirements-and-processes) - [**Requirement 3.1.5** — Least Privilege](https://support.icompaas.com/compliance/nist-sp-800-171-rev-3/3-1-5-least-privilege) ## References - [NIST Computer Security Resource Center — NIST SP 800-171 Rev. 3](https://csrc.nist.gov/pubs/sp/800/171/r3/final) - Catalogue identifier: `Requirement 3.16.1` Topics: governance riskpolicy managementsecure developmentthreat intelligence ## Related compliance guidance - [NIST SP 800-171 and CMMC: a practical guide to protecting CUI in the cloud](https://support.icompaas.com/compliance/nist-sp-800-171-rev-3): Start with the full NIST SP 800-171 implementation guide — scope, roadmap, evidence and how the assessment runs. - [NIST SP 800-53 Rev. 5: a practical implementation guide for cloud teams](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5): The catalogue 800-171 is tailored from, and the basis of the FedRAMP Moderate baseline your cloud providers must meet for CUI. - [ISO/IEC 27001:2022 compliance: a practical implementation guide](https://support.icompaas.com/compliance/iso-27001-2022): If commercial customers ask for a certificate as well, most 800-171 controls can be evidenced once and mapped to Annex A.