This NIST SP 800-53 database represents the security controls and associated assessment procedures defined in NIST SP 800-53 Revision 4 Recommended Security Controls for Federal Information Systems and Organizations. Any discrepancies noted in the content between this NIST SP 800-53 database and the latest published NIST Special Publication SP 800-53 Revision 4, please refer to the official published documents that is posted on http://csrc.nist.gov.