Cause and Effect Diagram

A decomposition technique that helps trace an undesirable effect back to its root cause. Also known as fishbone or Ishikawa diagram.

Quality

• ECO 2026 — PMP Examination Content Outline 2026
• PMBOK 7 — PMBOK Guide, 7th Edition
• ISO 21502 — ISO 21502:2020

• PMI, PMP Examination Content Outline (2026)
• PMI, A Guide to the Project Management Body of Knowledge (PMBOK Guide), 7th Edition
• ISO 21502:2020, Project, programme and portfolio management — Guidance on project management

Al Sawady, B. (2026). "Cause and Effect Diagram." Bayhas PM Lexicon. https://lexicon.bayhaspm.com/en/terms/cause-and-effect-diagram (version 2026-08-30)

Version date: 2026-08-30