CAPM Predictive Plan-Based Methodologies Practice Question
In a predictive project life cycle, which three of the following are characteristics of a work breakdown structure (WBS)? (Choose three)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The lowest level is called a work package.
Option B is correct because in a WBS the lowest level of each branch is the work package, the smallest deliverable or work component that can be estimated, scheduled, monitored, and controlled. Option C is correct because the WBS is created by decomposing the total scope, so it serves as a completeness check that all project deliverables and scope are captured and nothing is omitted. Option D is correct because the WBS is by definition a hierarchical decomposition of the total scope of work to be carried out by the project team to accomplish the objectives and create the required deliverables. Option A is not correct because assigning roles and responsibilities is done through tools such as a RACI chart or responsibility assignment matrix, not the WBS itself. Option E is not correct because the WBS displays scope elements only; cost estimates are developed separately (for example, in the cost baseline or activity cost estimates) and are not inherent components of the WBS.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It is used to assign project roles and responsibilities.
Why it's wrong here
The WBS decomposes scope into deliverables and work packages; role assignment belongs to a responsibility assignment matrix such as RACI, produced separately. It is tempting because work packages are later resourced, but the WBS itself defines scope, not organisational accountability.
- ✓
The lowest level is called a work package.
Why this is correct
The WBS decomposes scope downward until reaching work packages, the lowest-level components where cost and duration can be reliably estimated and work assigned. This satisfies the structural characteristic that work packages sit at the bottom of the hierarchy.
- ✓
It ensures that all deliverables are identified.
Why this is correct
Because the WBS is built by decomposing the total scope, its branches collectively capture every deliverable required by the project. This completeness property satisfies the stem's requirement that all deliverables be identified, preventing scope omissions.
- ✓
It is a hierarchical decomposition of the total scope of work.
Why this is correct
A WBS hierarchically decomposes the total scope of work into manageable deliverables, satisfying the predictive life cycle's need for a fixed, fully defined scope baseline. This decomposition organises all project work, ensuring nothing outside scope is included and providing the foundation for estimating, scheduling and control.
- ✗
It includes cost estimates for each element.
Why it's wrong here
A WBS decomposes scope into deliverables and work packages only; cost estimates belong to the cost baseline and are applied through the budget, not embedded in WBS elements. It is tempting because work packages feed estimating, but the WBS is a scope artefact, not a costing one.
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