SP 800-53a is the sister document to SP 800-53.
NIST Special Publication 800-53 Revision 4
This document is the body of controls.
- Security and Privacy Controls for Federal Information Systems and Organizations
NIST Special Publication 800-53A Revision 4
This document provides guidance on how to assess – test for compliance – each control outlined in the body of controls.
- Assessing Security and Privacy Controls in Federal Information Systems and Organizations: Building Effective Assessment Plans