Which document details the hierarchy of project scope?

The document that details the hierarchy of project scope is the Work Breakdown Structure (WBS). The WBS is a crucial project management tool that breaks down the entire scope of a project into manageable sections or work packages. This hierarchical decomposition of the project allows for clear visualization and understanding of the project's parts, making it easier to assign tasks, estimate costs, and manage schedules.

By organizing the project's deliverables and objectives into a structured format, the WBS provides a comprehensive overview of all aspects of the project, ensuring that no critical elements are overlooked. It serves as a foundational document for project planning, providing guidance for defining, managing, and controlling the scope throughout the project lifecycle.

Other documents, while important in their respective areas – such as the Schedule Management Plan for scheduling processes or the Risk Management Plan for identifying and managing risks – do not specifically delineate the project's scope in the hierarchical format that the WBS does. The Communication Management Plan focuses on how information will be shared among stakeholders, rather than the breakdown of the project scope. Thus, the WBS is uniquely positioned to provide the detailed hierarchy of project scope that is essential for successful project execution.