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| Criterion |  Operations 5 Whys |  Operations Fault Tree Analysis |  Operations Root Cause Analysis |  Operations MORT Analysis |
|---|---|---|---|---|
Purposedifferent | For a single, hard-to-explain deviation, the method exposes the causal chain behind the visible symptom. It keeps the cause open until a controllable condition emerges instead of a mere description. | 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. | 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. | For a safety-relevant event or a system with high protection requirements, the method examines where controls failed. It exposes both technical and organizational gaps. |
Complexitydifferent | Low | High | Medium | High |
Timedifferent | 15-30 min | 2-6 h | 1-4 h | Mehrere Tage bis Wochen |
Participantsdifferent | 2-6 | 3-8 | 3-8 | 2-6 |
Formatdifferent | Workshop | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Root cause notes, Countermeasures | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Problem Statement, Cause Hypotheses, Confirmed Causes, Action Plan | MORT Worksheets, Findings per Branch, Corrective Actions, Systemic Recommendations |
Tags1 shared | Root causeIncidentLeanProblem solving | RiskRoot causeSafety | Root causeProblem solvingQualityIncident | Root causeSafetySystemicIncident |