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Certified Associate in Project Management · PMI
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- Work packages are the lowest-level components of the WBS. They represent the work that can be estimated, scheduled, monitored, and controlled. Work packages are then decomposed further into activities during schedule development, but activities are not part of the WBS itself. Milestones are zero-duration events that mark significant points in the project. Deliverables appear at various levels of the WBS but are not specifically the lowest level. The work package level is where cost and duration estimates are most reliably developed.