Transition from NIST SP 800-171 Revision 2 (r2) to Revision3 (r3) is essential for strengthening the protection of Controlled Unclassified Controlled Unclassified Information (CUI) in non-federal systems and organizations. Here are the key factors driving these changes:

1. Introduction and Purpose: some text
    
   • NIST SP 800-171r3 aims to enhance CUI security by providing updated guidelines.
 
2. Security Requirement Development Methodology: some: some text
    
   • The methodology for developing security requirements has been refined.
 
3. Specific Security Requirements: some: some text
    
   • Access Control: some text
      
     • Account management, access enforcement, and information flow enforcement have been addressed.
      
     • Separation of duties and least privilege principles are emphasized.
      
     • Unsuccessful logon attempts, system use notifications, and session termination are covered.
      
     • Remote access guidelines have been updated.
      
      
   • Other sections, such as wireless access, have also been revised.
 
4. Additional Resources: some: some text
    
   • Review the FAQs and the detailed analysis of changes between the two revisions.
    
   • Consider additional guidance from NIST SP 800-53 and other relevant publications.
    
   • NIST 800-171 Cybersecurity Support
    
   • NIST 800-171 r2 to r3 transition white paper

Remember that compliance with the latest version ensures robust protection of CUI and maintains trust with federal agencies and partners. 

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