What is a fishbone (Ishikawa) diagram used for?

• A. To identify and organize potential root causes of a problem across categories like people, process, equipment, materials, and environment.
• B. To map the sequence of steps in a process.
• C. To visualize project timelines.
• D. To track budget variances.

Answer: (B)

A fishbone diagram is a tool for root cause analysis that helps a team uncover and organize the potential reasons a problem occurred. It starts with the problem at the head of the fish and draws major branches for categories that commonly influence outcomes—such as people, process, equipment, materials, and environment. Each branch can be explored in more detail with sub-causes, so you can see how different factors relate and where to focus investigation or corrective actions. This visual organization makes brainstorming more systematic and helps prioritize where to intervene.

It isn’t about mapping the sequence of steps in a process—that’s a flowchart. It isn’t about visualizing project timelines—that would be a schedule or timeline chart. And it isn’t about tracking budget variances—that’s financial tracking.