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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.

ICS/OT Cybersecurity Fundamentals — Security Built for Industrial Systems

Industrial control systems cannot be secured like ordinary IT. A forced reboot, aggressive scan, or incompatible patch can interrupt production and create real safety consequences. Effective OT security begins with understanding the systems, constraints, and risks unique to industrial environments.

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ICS/OT Cybersecurity Fundamentals course preview

Run the drill before the incident runs you

Design, run and prove OT drills and tabletop exercises before an incident tests your team. OT Incident Drills and Exercises includes 24 lessons and practical exercise materials, delivered through HKSM Courses for US$47 one-time. 30-day money-back guarantee when 50% or less of the course has been consumed.

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