During a project, the team discovers that a completed deliverable does not meet a documented requirement. The project manager wants to determine the root cause of the quality problem so it does not recur. Which tool is BEST suited for this analysis?

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Cause-and-effect (Ishikawa) diagram. A cause-and-effect (Ishikawa/fishbone) diagram is specifically used to identify and organize the potential root causes of a problem or defect. Control charts monitor process stability over time, scatter diagrams examine relationships between two variables, and histograms display frequency distributions—none of which directly trace root causes.

During a project, the team discovers that a completed deliverable does not meet a documented requirement. The project manager wants to determine the root cause of the quality problem so it does not recur. Which tool is BEST suited for this analysis?

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