Answer:
Change request is the type of document which basically contain the adjustment of the system by call and the change request is the essential and important part in the process of change management.
Change request must be declarative as, it state that what should be accomplish, but forget about the change that should be completed. The main elements or parts of the change request are:
The importance of the change request document is that it is used in various type of SDLC and project management system. It is basically originate from the system request from the users.
