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| Criterion |  Operations Root Cause Tree Analysis |  Engineering Hypothesis-Driven Troubleshooting |  Operations Barrier Analysis |  Operations MORT Analysis |
|---|---|---|---|---|
Purposedifferent | For a problem with several suspected causes, the method builds a causal structure instead of a mere list. It makes visible how causes connect and where the strongest points of leverage lie. | When systems fail unexpectedly, spontaneous attempts often produce more noise than insight. Hypothesis-driven Troubleshooting translates symptoms into testable assumptions and makes troubleshooting learnable. | For a risk that can only be managed through multiple layers of protection, the method examines the effectiveness of each barrier. It shows where safeguards are missing, too weak, or fail under real conditions. | 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 | Medium | Medium | Medium | High |
Timedifferent | 1-3 h | 30-240 min | 2-4 h | Mehrere Tage bis Wochen |
Participantsdifferent | 2-8 | 1-6 | 2-6 | 2-6 |
Formatdifferent | Workshop | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Cause Tree, Evidence Notes, Countermeasures | Hypothesis Log, Test Plan, Evidence Notes, Diagnosis Summary | Barrier Inventory, Failure Analysis per Barrier, Action Backlog | MORT Worksheets, Findings per Branch, Corrective Actions, Systemic Recommendations |
Tagsno overlap | Root causeTreeIncidentQuality | TroubleshootingProblem solvingDiagnosis | Root causeSafetyIncident | Root causeSafetySystemicIncident |