Configuration updates are changes made to the settings, parameters, or components of an IT system or network. Configuration updates can affect the functionality, performance, security, and reliability of the system or network. Therefore, configuration updates should follow formal change control, which is a process that ensures that changes are authorized, documented, tested, and implemented in a controlled manner. Formal change control can help prevent errors, conflicts, disruptions, and vulnerabilities that may arise from configuration updates. Configuration updates that do not follow formal change control should be of greatest concern to a risk practitioner when determining the effectiveness of IT controls, as they can introduce newrisks or compromise existing controls. References = Risk and Information Systems Control Study Manual, Chapter 3: Risk Response and Mitigation, Section 3.5: Control Monitoring and Reporting, p. 161-162.