Change management in the context of this paper is the process of setting, managing and meeting the expectations of stakeholders to ensure project success. It is not about scope control and management of changes to scope, schedule, or quality, although these attributes impact the change management process. These latter types of changes are usually known as "change control" or "engineering change control" which is a functional process within project management and is not considered in this paper.
Hence, we discuss change management as a project in its own right and how that relates to the successful delivery of projects. This aspect is distinct and different from "change control" and suggests the following definitions:
Change (noun): An event that occurs when something passes from one state or phase to another.
Management (noun): The act of managing something
Project (noun): A process that consumes resources and delivers a product, i.e. a change, within certain time constraints.