Work Package
The lowest level of the WBS, where work is estimated, scheduled, and assigned.
A work package is the lowest level of the Work Breakdown Structure (WBS), a discrete unit of work that can be uniquely assigned, estimated, scheduled, and monitored. It is where scope, cost, and schedule are measured, making it the foundation of earned value tracking using metrics such as Planned Value (PV) and Actual Cost (AC). The critical exam distinction is between a work package and an activity: work packages define what must be produced, then are decomposed into schedule activities during the Define Activities process, which determine how the work is executed. Confusing the two levels causes scope-versus-schedule errors.
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