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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?

  1. Activity
  2. Control account
  3. Work package
  4. 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.

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This is not abstract theory. You’ll work step by step through Earned Value Management (EVM), learning how cost, schedule, and scope come together to show true performance. You’ll build a solid foundation in EVM concepts, understand why formulas work, and learn how performance data actually supports leadership decisions.

You’ll master Work Breakdown Structures (WBS), control accounts, and budget baselines, then apply core EVM metrics like EAC, TCPI, and variance analysis. Through a detailed real-world example, you’ll forecast outcomes, analyze trends, and understand contingencies and management reserves with confidence.

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