ITPEC FE Morning October 2022 Question 53

To decompose the development work into manageable sub-tasks organized as a hierarchy — that is what a WBS (work breakdown structure) does.

The WBS breaks the whole scope of the project down level by level, from deliverables to smaller components, until the lowest items, the work packages, are small enough to estimate, schedule, assign and control. Everything in the scope appears in the WBS and anything not in it is out of scope, so it is the basis for estimating cost and duration and for building the schedule.

Answer (b)

Why not others:

• •(a) — showing the order of activities and finding the critical path is done with an arrow diagram (PERT/CPM network)
• •(c) — optimizing cost against duration when shortening the schedule costs money is schedule crashing, the time-cost trade-off analysis
• •(d) — bars showing start and end dates and current progress are a Gantt chart

Key rule: The WBS decomposes scope into a hierarchy of deliverables; the network diagram orders the activities, and the Gantt chart shows them on a calendar.

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