Security Engineering Principles is the first requirement in the System and Services Acquisition (03.16) family, and it is about building security in rather than bolting it on. It requires applying defined systems security engineering principles whenever you develop or modify the system and its components. Security Engineering Principles (03.16.01) requires applying those principles to development or modification of the system and system components. Per the NIST discussion, organizations apply systems security engineering principles to new development systems, and for legacy systems they apply the principles to system modifications to the extent feasible given the current state of hardware, software, and firmware components.
A common difficulty with this requirement is treating it as an abstract philosophy rather than a documented, assessable set of principles. R3 requires you to define which principles you apply and then show they are applied, so "we follow good engineering practice" does not demonstrate either objective. Per the NIST discussion, examples include developing layered protections, establishing security policies, architectures, and controls as the foundation for system design, incorporating security requirements into the system development life cycle, delineating physical and logical security boundaries, ensuring that developers are trained on how to build trustworthy secure software, and performing threat modeling.
Where things stand for companies facing the transition from NIST 800-171 R2 to R3:
The following is reproduced verbatim from NIST 800-171 R3, requirement 03.16.01 Security Engineering Principles. Only the formatting has been adjusted for readability. This is a single statement with no lettered parts:
The source control is SA-08 from NIST 800-53. The bracketed assignment is the Organization-Defined Parameter (ODP): the systems security engineering principles. Per the NIST discussion, the application of systems security engineering principles helps to develop trustworthy, secure, and resilient systems, reduce the susceptibility of organizations to disruptions, hazards, and threats, and make informed risk-management decisions. You can read the requirement directly at NIST 800-171 R3, 03.16.01 (p. 70).
Note that this requirement is titled Security Engineering Principles in NIST 800-171 R3, while NIST 800-171A R3 titles it Systems Security Engineering Principles. Both refer to the same requirement, and the requirement text itself uses the phrase systems security engineering principles.
One (1) value sits inside this requirement. Depending on your contract, your organization may be permitted to define it. Organizations in the DIB subject to CMMC are not, because the DoD has defined it as policy.
The value below comes from Attachment A of the DoD Chief Information Officer (CIO) memorandum dated 10 April 2025 (signed David W. McKeown). The memo identifies each parameter by requirement sub-part, while NIST 800-171A R3 identifies the same parameter by ODP number. Both identifiers appear below so you can match your System Security Plan (SSP) language to either document.
The guidance for 03.16.01, quoted from the memo:
At a minimum, documentation that provides user and administrator guidance for the implementation and operation of controls. The level of detail required in such documentation should be based on the degree to which organizations depend on the capabilities, functions, or mechanisms to meet risk response expectations. Requirements can include mandated configuration settings that specify allowed functions, ports, protocols, and services. Acceptance criteria for systems, system components, and system services are defined in the same manner as the criteria for any organizational acquisition or procurement.
Where the memo gives guidance rather than a fixed value, the guidance tells you how to approach the decision and the decision itself remains yours to make and document. The memorandum does this in four (4) instances across the whole publication.
The memo states that its values "will be updated as necessary," so confirm against the current version before writing them into policy.
NIST 800-171A R3 breaks 03.16.01 into two (2) assessment objectives: one (1) Organization-Defined Parameter (ODP) and one (1) determination statement. These AOs are:
The two (2) objectives are defining the principles and applying them. If you are a DoD contractor, the ODP is specified. Per the DoD-specified ODP guidance in ComplianceForge's NIST 800-171 R3 Transition Guide, at a minimum this means documentation that provides user and administrator guidance for the implementation and operation of controls, with the level of detail based on the degree to which the organization depends on the capabilities, functions, or mechanisms to meet risk response expectations. That guidance further notes that requirements can include mandated configuration settings specifying allowed functions, ports, protocols, and services, and that acceptance criteria for systems, system components, and system services are defined in the same manner as the criteria for any organizational acquisition or procurement. The full guidance on assessment methods and objects, is in NIST 800-171A R3, 03.16.01 (p. 92).
Examine: system and services acquisition policy; system and services acquisition procedures; procedures addressing security engineering principles used in the development and modification of the system; system design documentation; security requirements and specifications for the system; system security plan.
Interview: personnel with acquisition/contracting responsibilities; personnel with information security responsibilities; personnel with system development and modification responsibilities; system developers.
Test: processes for applying security engineering principles in system development and modification; mechanisms supporting the application of security engineering principles in system development and modification.
03.16.01 maps from NIST 800-171 R2 requirement 3.13.2 (employ architectural designs, software development techniques, and systems engineering principles that promote effective information security within organizational systems):
Mapped against the two (2) AOs, both (2) are indirect (moderate effort), with none direct, net new, or unmapped. The concept carries forward from R2 3.13.2, but the framing changed in two ways worth noting. R3 moved the requirement out of the System and Communications Protection family into System and Services Acquisition, and it now requires the principles to be defined as a parameter rather than left implicit in the phrase "systems engineering principles." Confirm you have a written set of principles rather than assuming your R2 architectural practice satisfies the defining objective.
Source Control in NIST 800-53 R5:
Secure Controls Framework (SCF) Crosswalk
Organizations running a single control set across multiple frameworks can satisfy 03.16.01 through the following SCF controls:
The crosswalks from NIST 800-171 R3 and NIST 800-171A R3 to the SCF are available at no cost through the SCF Set Theory Relationship Mapping (STRM): https://securecontrolsframework.com/start-here/set-theory-relationship-mapping-strm. The STRM also carries the relationship type for each mapping (Equal, Subset Of, Intersects With), which tells you whether an SCF control fully satisfies the requirement or only part of it. Mapping above taken from SCF 2026.3.
The following are issues teams may encounter rather than certainties. They are about making the principles concrete, each of which needs documented evidence of due diligence and due care such as policies, standards, procedures, and configuration screenshots:
Reasonable objective evidence for an assessment is often subjective. The following examples of evidence to address NIST 800-171 R3 03.16.01 are sourced from the SCF Evidence Request List (ERL), available at https://securecontrolsframework.com/free-content/scf-download. These ERL artifacts are mapped to NIST 800-171 R3 03.16.01 through SCF controls. They establish a starting point for discussions on what an organization needs to have for evidence of due diligence and due care to withstand external scrutiny by an assessor or regulator.
Alongside these, keep the System Security Plan (SSP) narrative for 03.16.01 recording the ODP values you adopted.
With both AOs mapping indirectly, 03.16.01 is a moderate lift centered on writing down what you already do. A realistic sequence:
What value does the DoD require for the organization-defined parameter in NIST 800-171 R3 03.16.01? R3 leaves the value to the organization. For the DIB, the DoD set it in the 10 April 2025 memorandum under ODP identifier 03.16.01: guidance rather than a fixed value. At a minimum, documentation that provides user and administrator guidance for the implementation and operation of controls. The level of detail required in such documentation should be based on the degree to which organizations depend on the capabilities, functions, or mechanisms to meet risk response expectations. Requirements can include mandated configuration settings that specify allowed functions, ports, protocols, and services. Acceptance criteria for systems, system components, and system services are defined in the same manner as the criteria for any organizational acquisition or procurement.
How many assessment objectives does NIST 800-171 R3 03.16.01 have? NIST 800-171A R3 breaks 03.16.01 into two (2) assessment objectives: one (1) Organization-Defined Parameters (ODPs) and one (1) determination statements. An assessor works through each one separately, so each needs its own evidence.
Which NIST 800-53 R5 control does NIST 800-171 R3 03.16.01 come from? SA-08.
Where does NIST 800-171 R3 03.16.01 sit in the NIST 800-171 R3 Kill Chain? Phase 9, Change Management (CM). The Kill Chain is a phased model for sequencing R3 implementation, and it assigns this requirement to that phase.
03.16.01 Security Engineering Principles applies a defined set of systems security engineering principles to the development or modification of the system and system components. It maps indirectly from R2 3.13.2, relocated into the System and Services Acquisition family, with both objectives transitioning as moderate effort. The recurring problem is treating good engineering practice as self-evident. Write the principles down, apply them to modifications as well as new builds, and show the design and change records that prove it.
Authoritative sources:
Authoritative sources:
This guide reproduces U.S. Government text from NIST 800-171 R3 and NIST 800-171A R3 and references the DoD ODP memorandum of 10 April 2025. It is educational, not legal or assessment advice. Last reviewed: 2026-09-22.
