CAPM Practice: Demonstrate an understanding of project management planning

A milestone is a significant checkpoint or event in a project schedule that has zero duration—it marks the completion of a phase or deliverable. Task duration, by contrast, represents the actual time needed to complete a specific work activity.

**Why not A:** Milestones and task durations are fundamentally different concepts, not the same thing used in different methodologies. A milestone is a zero-duration point in time, while task duration is a measurable period — this distinction applies across all project management methodologies.

**Why not B:** A milestone is not longer than a task duration — it has zero duration. A milestone marks a significant point or event in the schedule. While it may be associated with the completion of multiple tasks, it does not encompass or contain them; it simply marks when they are complete.

**Why not D:** Milestones do not require resources to complete because they have zero duration — they are markers, not work activities. Task durations do require resources, as they represent the actual time and effort needed to complete work. This option reverses the relationship entirely.