A RACI chart would be the most useful option for the project manager to illustrate roles for major project activities for an upcoming project kickoff. A RACI chart is a visual representation of a RACI matrix that shows who is responsible, accountable, consulted, and informed for each task or activity in a project using a table format. A RACI chart can help to communicate and document the roles and expectations of each team member and stakeholder for the project and ensure alignment and agreement.