When a stakeholder requests changes that could impact the project scope, the project manager should first review and validate the scope management plan. This plan outlines how scope changes are managed and controlled. If the new ideas are not covered within the existing project scope, they may require a formal change request and impact analysis before proceeding. This ensures that any changes align with project objectives and do not adversely affect project constraints such as time, cost, and quality. : Project Management Institute. (2017). A Guide to the Project Management Body of Knowledge (PMBOK Guide) - Sixth Edition. Project Scope Management according to the PMBOK1. The PMBOK's Project Scope Management Knowledge Area2. Project scope management: Plan, template, and guide3.