Continuous monitoring is the most effective way to identify changes in an information security environment, as it provides ongoing awareness of the security status, vulnerabilities, and threats that may affect the organization’s information assets and risk posture. Continuous monitoring also helps to evaluate the performance and effectiveness of the security controls and processes, and to detect and respond to any deviations or incidents in a timely manner. (From CISM Review Manual 15th Edition and NIST Special Publication 800-1371)