What document provides the baseline to evaluate if requests for changes or additional work fall within the project's boundaries?

The Project Scope Statement serves as the essential document that outlines the project's deliverables, objectives, and the boundaries of what is included or excluded from the project. It provides a clear definition of the project's scope, making it a critical reference point for assessing any change requests or additional work. When change requests are made, project managers and stakeholders can refer to the Scope Statement to determine if the proposed changes are within the original scope or if they would require modifications to the project plan or objectives.

In comparison, the Change Management Plan outlines how changes will be managed throughout the project but does not define the scope itself. The Project Plan encompasses a range of details, including schedules and resources, but still relies on the Scope Statement to establish the boundaries of the project. The Requirements Document details specific requirements but does not explicitly set the project's overall scope in the way that the Project Scope Statement does. Thus, the Project Scope Statement is the most appropriate document for evaluating change requests against the project's defined boundaries.