According to the PMBOK Guide, change requests are inevitable in any project and should be managed through an integrated change control process. This process involves analyzing the impact of the change on the project objectives, scope, schedule, cost, quality, risk, and other factors, and then deciding whether to approve or reject the change. If the change is approved, the project manager should update the project management plan and other relevant documents accordingly. The project manager should also communicate and negotiate with the stakeholders, especially the client, about the impact of the change and the possible trade-offs or alternatives. The project manager should not instruct the team to accommodate the changes without proper analysis and approval, as this would violate the project management plan and the agreed scope. The project manager should not review the project charter to identify the agreed scope, as this would not address the issue of the change requests and their impact on the project. The project charter is a high-level document that authorizes the project and defines its objectives, scope, and key stakeholders, but it does not provide the details of how the scope will be managed and controlled. The project manager should not escalate the issue to senior management, as this would imply that the project manager is unable to handle the change requests and their impact on the project. The project manager should only escalate the issue if the change requests are beyond the project manager's authority or responsibility, or if the client is unreasonable or uncooperative. References:
PMBOK Guide, 7th edition, pages 112-113, 118-119, 122-123; Project and Process Tailoring for the PMP Exam