Book excerpt: This book enhances the original NIST SP 800-53 rev 5 Security and Privacy Controls for Information Systems publication. NIST SP 800-53 rev 5 is a reference publication that establishes controls for federal information systems and organizations. It is used as a key part in the process of protecting and assessing the security posture of information systems. The security controls protect the confidentiality, integrity, and availability (CIA) of the system and its information. The Publication is enhanced by making the following changes while maintaining the original content:1.Add Illustrations2.Explain Security Controls Purpose and Use in Plain Language (Enhanced Supplemental Guidance) 3.Document Formatting Improvements for Easier Reading 4.Remove Lesser Used Sections