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| Criterion |  Operations Fishbone Diagram |  Operations Fault Tree Analysis |  Operations Kepner-Tregoe |  Operations Root Cause Analysis |
|---|---|---|---|---|
Purposedifferent | When a problem has several possible contributing factors, the method sorts causes by cause areas. It prevents an initial hunch from blocking the view of other plausible drivers. | For a critical top event with several possible triggers, the method logically models failure paths. It makes visible which combinations of conditions can lead to damage. | For a disturbance that's hard to pin down, the method cleanly separates problem, cause, and decision. It reduces mixing when symptoms allow several interpretations. | When a problem keeps recurring and the cause stays unclear, the method exposes the underlying mechanism. It separates symptom, guess, and robust explanation from one another. |
Complexitydifferent | Low | High | High | Medium |
Timedifferent | 30-60 min | 2-6 h | 2-8 h | 1-4 h |
Participantsdifferent | 2-8 | 3-8 | 2-8 | 3-8 |
Formatdifferent | Workshop | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Fishbone Diagram, Cause Categories, Investigation Backlog | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Problem Analysis, Decision Analysis, Risk Plan | Problem Statement, Cause Hypotheses, Confirmed Causes, Action Plan |
Tags1 shared | Root causeQualityOperations | RiskRoot causeSafety | Problem solvingRoot causeDecisionOperations | Root causeProblem solvingQualityIncident |