Learn in the textbookChange and Service Transition
DefinitionService transition (サービスの移行) is the planning and carrying out of moving a new or changed service from the development or test environment into live operation.
ExplanationWhat gets moved includes not just software and equipment but also operating procedures, the staffing of those in charge, and guidance for users. Once the service is in production, responsibility passes from the development side to the operations staff, and day-to-day operation begins.