Change Management is first and foremost a process. It is a process involving all of IT. It must have the highest management support. The following are roles and responsibilities that need to be in place before embarking on a Change Management process. These must be in place before a change management process can be successfully implemented. Consider SaaS (Software-as-a-Service) to make getting up and running faster, easier and less expensive.
Please see https://www.givainc.com/change-management-software/index.htm for more information.