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Resource Breakdown Structure

A hierarchical breakdown that organizes project resources into categories and specific types.

Key Points

  • Displays resources in tiers, such as category > type > specific resource.
  • Supports estimating, budgeting, and planning by clarifying what resources are needed.
  • Helps reveal resource gaps, overlaps, and risks early in the project.
  • Complements the WBS and OBS by focusing on resources rather than deliverables or reporting lines.

Example

On a construction project, the RBS might show Labor (carpenters, electricians), Equipment (cranes, excavators), Materials (concrete, rebar), Services (surveying, inspections), and Facilities (site office, storage). Each category then breaks down into specific types and quantities needed.

PMP Example Question

A project manager needs a document that groups all labor, equipment, materials, and services in a hierarchical list by category and type. Which tool should they use?

  1. Work Breakdown Structure
  2. Resource Breakdown Structure
  3. RACI Matrix
  4. Organizational Breakdown Structure

Correct Answer: B — Resource Breakdown Structure

Explanation: The RBS is the hierarchy that organizes resources by category and type; the WBS structures deliverables, the RACI shows responsibilities, and the OBS shows reporting relationships.

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