Work Package
The smallest element in the WBS that is defined clearly enough to plan, estimate, and control its cost and duration.
Key Points
- Exists at the lowest level of the work breakdown structure (WBS).
- Has estimated and managed cost, duration, scope, and acceptance criteria.
- Serves as the basis for creating schedule activities and assigning resources.
- Rolls up to control accounts for performance tracking and reporting.
Example
In a building project, "Install drywall on the second floor" is a work package. It includes a defined scope (all second-floor walls), an estimated duration (3 days), a budget (e.g., $15,000), and assigned resources (crew and materials). Progress and costs are tracked against this package.
PMP Example Question
In a WBS, which element is the lowest-level component where cost and schedule are planned and controlled?
- Activity
- Control account
- Work package
- Milestone
Correct Answer: C — Work package
Explanation: A work package is the lowest-level WBS element used to estimate and manage cost and duration. Activities are derived from work packages; control accounts aggregate multiple work packages; milestones have zero duration.
