According to the PMBOK® Guide, specifically the Create WBS process, the Work Breakdown Structure (WBS) is a hierarchical decomposition of the total scope of work to be carried out by the project team. The activities described in the question are the core components of the Decomposition technique.
Identifying Major Deliverables: The first step in creating a WBS is identifying the high-level deliverables or phases of the project. This ensures that the entire scope is captured before moving into details.
Deciding if Adequate Cost Estimates Can Be Developed: This refers to the concept of the Work Package. A work package is the lowest level of the WBS. It is defined as the point at which cost and duration can be reliably estimated and managed. If a component is still too vague to estimate, it must be decomposed further.
Identifying Tangible Components: The WBS is " deliverable-oriented. " By breaking the project down into tangible components, the project manager can assign responsibility, track progress, and ensure that no " gold plating " (work outside the scope) occurs.
The 100% Rule: A key principle of the WBS is that it includes 100% of the work defined by the project scope and captures all deliverables—internal, external, and interim.
Comparison with other options:
B. Organizational breakdown structure (OBS): While similar in hierarchy, the OBS is used to show which organizational units or departments are responsible for specific work packages. It focuses on people/departments, not the deliverables themselves.
C. Resource breakdown structure (RBS): The RBS is a hierarchical representation of resources by category and type (e.g., labor, material, equipment). It is used for resource management, not for defining the scope or deliverables of the project.
D. Bill of materials (BOM): A BOM is a table or list of the raw materials, sub-assemblies, and components needed to manufacture a product. While it identifies components, it is a manufacturing/technical document rather than a project management tool used for cost estimation and scope control across the whole project lifecycle.
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