CAPM Practice: Demonstrate an understanding of project management planning

A milestone marks a significant point or event in the project schedule and has zero duration—it represents achievement of a deliverable or completion of a phase. Task duration represents the actual time required to complete a specific work activity.

**Why not A:** Milestones are used in both agile and predictive projects. They mark significant points or events regardless of the project approach. This distinction is about duration (zero vs. measurable), not about project methodology.

**Why not C:** Milestones and task durations are not distinguished by their unit of measurement. Both can be expressed in any time unit. The key difference is that milestones have zero duration while tasks have a measurable time span.

**Why not D:** Milestones do not always occur at the end of a project phase. They can mark any significant point, such as approval gates, key deliverables, or decision points throughout the project schedule.