A milestone chart is a tool that shows the key events or deliverables of a project along a timeline12. A milestone chart is useful for tracking the progress of a project that has technical tasks and requires a SME’s knowledge, because it can provide a high-level overview of the project status, without getting into the details of each task or activity34. A milestone chart can help the PM and the project lead communicate the project achievements, challenges, and expectations to the stakeholders, and also identify any potential risks or delays that may affect the project completion56. A milestone chart is better than the other options because:

A Gantt chart is a tool that shows the tasks, dependencies, durations, and resources of a project along a timeline7. A Gantt chart is more detailed and complex than a milestone chart, and may not be suitable for providing high-level updates to the stakeholders8.

A project organization chart is a tool that shows the roles, responsibilities, and reporting relationships of the project team members and other stakeholders9. A project organization chart is not a tool for tracking project data, but rather for defining the project structure and authority10.

A Program Evaluation Review Technique (PERT) chart is a tool that shows the tasks, dependencies, and critical path of a project along a network diagram. A PERT chart is more focused on the sequence and timing of the project tasks, and may not capture the key milestones or deliverables of the project.

References = CompTIA Project+ Certification Study Guide, CompTIA Project+ Certification Exam Objectives, What is a Milestone Chart?1, How to Create a Milestone Chart in Excel in 3 Steps2, Milestone Chart: The Easiest Way to Track Project Milestones3, How to Use Milestones in Project Management4, What is a Gantt Chart?5, Gantt Chart vs Milestone Chart: What’s the Difference?6, What is a Project Organization Chart?7, How to Create a Project Organization Chart8, What is a PERT Chart?9, PERT Chart vs Gantt Chart: What’s the Difference?10