Milestone
A significant point or event in the project that has zero duration.
A milestone is a significant event in a project schedule that carries zero duration — it marks a moment in time rather than a span of work. Common examples include phase-gate approvals, completion of a key deliverable, or formal sign-off by a sponsor. The key exam distinction is between a milestone and a deliverable: a deliverable is a tangible output produced through work effort and therefore has duration, while a milestone simply marks when a noteworthy event occurs. On the PMP exam, watch for schedule-progress scenarios — milestones communicate status without implying effort or cost consumption, making them a useful reference point for executives and steering committees.
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