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Certified Associate in Project Management · PMI
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- A milestone is a significant point or event in the project that has zero duration. Milestones represent key achievements, decision points, or deliverable completions - such as "Design Approved" or "Phase 2 Complete." They do not consume resources or time; they simply mark that something has been accomplished. The longest-duration task is part of the critical path concept, the first activity in each phase is simply a starting activity, and critical path tasks are activities with float constraints, not milestones.