Learn in the textbookChange and Service Transition
DefinitionChange management (変更管理) is the process that takes in change requests for a service, assesses their impact and risk, decides whether they may go ahead, and controls approved changes so they proceed as planned.
ExplanationA change request (RFC) is a recorded proposal to modify a service, such as adding a feature, fixing a defect or revising a setting. Change management checks how far the impact reaches using configuration management's records before deciding, and also sets the priority of the work.
AnalogyIt is like a condo board reviewing renovation work. It takes a resident's request, looks at the effect on the whole building before giving permission, and then schedules the work.
Memory hookThe entry document, RFC, stands for Request for Change: the request every change starts from.