ITPEC IP April 2024 Question 56

A WBS defines the activities and deliverables, so it is the basis for estimating person-days — every work package in it can be estimated, assigned and scheduled.

A WBS (Work Breakdown Structure) breaks the project's deliverables and work down hierarchically until each lowest element, a work package, is small enough to estimate and manage. The person-days of the project are then built up from the work packages, and the schedule and responsibilities are laid out on the same elements.

Answer (a)

Why not others:

• •(b) — the WBS covers exactly the project scope; work outside the scope must be left out, or it would be estimated and done without being part of the project
• •(c) — each project, and each branch within one, is broken down only as deep as it needs to be managed; there is no fixed number of levels
• •(d) — all in-scope work must appear in the WBS (the 100% rule), even work similar to other activities; anything left out is neither estimated nor tracked

Key rule: The WBS holds 100% of the scope and nothing outside it, and its work packages are the units for estimating, scheduling and assigning work.

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