What is the lowest level in the WBS at which the cost and activity durations for the work can be reliably estimated and managed?

Question

Options

• AWork product
• BWork package
• CProject deliverable
• DScope baseline

• A
  3% (1)
• B
  79% (23)
• C
  10% (3)
• D
  7% (2)

Explanation

Work packages (B) are the lowest-level components of a WBS where cost and duration estimates become reliable - they represent discrete, assignable chunks of work with clear boundaries, making them the foundational unit for scheduling and cost control in project management.

Why the distractors fail:

• A (Work product) - a deliverable artifact, not a WBS decomposition level; it describes what is produced, not the schedulable unit of work.
• C (Project deliverable) - deliverables sit higher in the WBS hierarchy and are too broad for reliable estimation at that level.
• D (Scope baseline) - the scope baseline contains the WBS (plus the WBS dictionary and project scope statement), but is a planning document, not a WBS level.

Memory tip: Think "pack it up to ship it" - a work package is small enough to pack (estimate and assign) but meaningful enough to deliver. If you can put a person's name and a dollar sign on it, you're at the work package level.

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