According to the PMBOK Guide, the Perform Integrated Change Control process is essential for reviewing all change requests, approving changes, and managing changes to deliverables, organizational process assets, project documents, and the project management plan1. It involves an integrated approach to assess the potential impact of a suggested modification before executing it. This ensures that any changes align with project goals and do not adversely affect project constraints such as scope, schedule, cost, and quality. The project manager should not unilaterally implement changes without proper evaluation and authorization, which is typically provided by the change control board (CCB). The CCB's role is to review the impacts of the proposed change and make a decision to approve or reject it2.
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A Guide to the Project Management Body of Knowledge (PMBOK Guide)1.
Role of a Change Control Board in Project Management in 20242.