Project Change Request (PCR) is a formal document used to request changes to an existing project. It is the process of requesting, recording, assessing, approving, and implementing changes to a project. PCs are used to ensure that changes to a project are managed in a consistent and controlled manner. They are also used to help ensure that any changes made to a project are tracked and recorded for future reference. Types of PCs include: 1. Scope Change Request: Used to request a change to the scope of a project. 2. Time Change Request: Used to request a change to the timeline of a project. 3. Resource Change Request: Used to request a change to the resources allocated to a project. 4. Cost Change Request: Used to request a change to the cost of a project. 5. Risk Change Request: Used to request a change to the risk associated with a project. 6. Quality Change Request: Used to request a change to the quality of a project.