What is a milestone in project planning?

• A. A cost control point in the budget.
• B. A document approval gate.
• C. A project deliverable.
• D. A significant point or event in the project schedule that marks the completion of a phase or a deliverable.

Answer: (D)

Milestones are significant events in the project schedule that mark the completion of a phase or deliverable. They serve as progress indicators and decision points to proceed to the next phase, often triggering reviews and resource movements. They have no duration and aren’t themselves deliverables or outputs. While gates or approvals can be tied to milestones, the defining idea is that a milestone signals a completed stage in the plan.