Change Management is performed by the Project Manager, but the changes proposed are subject to approval by the Project Sponsor
Change approval or rejection is carried out by the Project Sponsor. The Project Manager gives the most suitable information about the changes to help the Project Sponsor make the best decision.
Change Request, Corrective Actions and Preventive Actions can affect:
Scope
Cost
Schedule
Quality
Procurement
Resources
Risks
Communications
The outputs of Change Management are:
Approved or rejected Change Request
Approved or rejected Preventive Actions
Approved or rejected Corrective Actions