According to the PMBOK® Guide, specifically the Develop Project Charter process, the project charter is the document issued by the project initiator or sponsor that formally authorizes the existence of a project and provides the project manager with the authority to apply organizational resources to project activities.

Content of the Project Charter: The charter contains high-level information because it is created during the Initiating phase when detailed data is not yet available. Key components include:

Project purpose or justification.

Measurable project objectives and related success criteria.

High-level requirements.

High-level risks.

Summary milestone schedule and summary budget.

Purpose of High-Level Risks: Identifying risks at this stage helps the sponsor and the project manager understand the major threats or opportunities that could affect the project ' s feasibility before a significant investment is made. These are later refined into detailed risks during the Identify Risks process in the Planning phase.

Comparison with other options:

A. Business case: While it provides the economic justification and may mention very high-level constraints, the formal project document that lists " high-level risks " as a required element is the project charter.

B. Risk breakdown structure (RBS): This is a tool/representation used to categorize risks by their sources (e.g., Technical, External, Organizational). it is a framework for identification, not a document that lists the risks themselves.

D. Risk register: This document is the primary output of the Identify Risks process. It contains detailed individual project risks, their root causes, and potential responses. It is much more granular than the high-level risks found in the charter.