A new project manager would use a Responsible, Accountable, Consult, and Inform (RACI) chart to identify the responsibilities of the stakeholders in the project. The RACI chart is a specific type of Responsibility Assignment Matrix (RAM) that clarifies roles and responsibilities by assigning them to various categories. The RACI chart helps to ensure clear communication and delineation of duties among stakeholders, making it the optimal tool for this purpose.