How many control families are in NIST 800-53 Revision 5?

NIST Special Publication 800-53 Revision 5 defines 20 control families.

These 20 families group the individual security and privacy controls into logical categories (for example, Access Control, Configuration Management, System and Information Integrity). The exact controls you need to address in a regulated manufacturing environment depend on:

• Your system categorization and risk assessment
• Whether the system handles federal information, CUI, export-controlled data, or safety-relevant data
• How your OT, MES, ERP and plant-floor systems are architected and segmented
• Existing corporate policies, compensating controls, and contractual requirements

Simply mapping to the 20 families does not ensure compliance, audit outcomes, or certification. For brownfield industrial environments, implementing NIST 800-53 typically requires incremental changes, integration with legacy controls, and careful documentation for traceability, validation, and change control rather than wholesale system replacement.