A change management process is a set of procedures and activities that aim to ensure that changes in an organization’s IT systems and services are implemented in a controlled and coordinated manner. The effectiveness of a change management process can be measured by how well it reduces the risks and costs associated with changes, and how well it supports the business objectives and customer expectations. One of the best metrics to demonstrate the effectiveness of a change management process is the percent of unauthorized changes. Unauthorized changes are changes that are made without following the established change management process, such as obtaining approval, documenting the change, testing the change, and communicating the change. Unauthorized changes can introduce errors, defects, security breaches, and disruptions to the IT systems and services, and can negatively affect the business performance and customer satisfaction. Therefore, a low percent of unauthorized changes indicates that the change management process is effective in ensuring that changes are properly planned, approved, executed, and monitored. The other options are not the best metrics to demonstrate the effectiveness of a change management process, as they do not directly reflect the quality and control of the changes. An increase in the frequency of changes may indicate that the organization is agile and responsive to the changing business needs and customer demands, but it does not necessarily mean that the changes are well-managed and beneficial. An increase in the number of emergency changes may indicate that the organization is able to handle urgent and critical situations, but it may also suggest that the organization is reactive and lacks proper planning and analysis of the changes. The average time to complete changes may indicate the efficiency and speed of the change management process, but it does not measure the effectiveness and value of the changes. References = CRISC Review Manual, pages 156-1571; CRISC Review Questions, Answers & Explanations Manual, page 712