NIST 800-53 REV 5 • SYSTEM AND SERVICES ACQUISITION
SA-4(2) — Design and Implementation Information for Controls
Require the developer of the system, system component, or system service to provide design and implementation information for the controls that includes: {{ insert: param, sa-04.02_odp.01 }} at {{ insert: param, sa-04.02_odp.03 }}.
CMMC Practice Mapping
No direct CMMC mapping
NIST 800-171 Mapping
No direct NIST 800-171 mapping
Related Controls
No related controls listed
Supplemental Guidance
Organizations may require different levels of detail in the documentation for the design and implementation of controls in organizational systems, system components, or system services based on mission and business requirements, requirements for resiliency and trustworthiness, and requirements for analysis and testing. Systems can be partitioned into multiple subsystems. Each subsystem within the system can contain one or more modules. The high-level design for the system is expressed in terms of subsystems and the interfaces between subsystems providing security-relevant functionality. The low-level design for the system is expressed in terms of modules and the interfaces between modules providing security-relevant functionality. Design and implementation documentation can include manufacturer, version, serial number, verification hash signature, software libraries used, date of purchase or download, and the vendor or download source. Source code and hardware schematics are referred to as the implementation representation of the system.
Practitioner Notes
Go beyond functional descriptions — require vendors to provide design and implementation details for their security controls. You need to know how controls are built, not just what they claim to do.
Example 1: Request vendors provide architecture diagrams showing how security controls are implemented: where encryption is applied in the data flow, how authentication tokens are managed, where audit logs are stored, and how network segmentation is achieved. Review these against your security requirements.
Example 2: For critical acquisitions, include contract language requiring the vendor to provide design documentation sufficient for independent security assessment. This might include API security specifications, key management procedures, and vulnerability management processes — enough detail to verify their claims are backed by solid engineering.