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| Criterion |  Operations Fault Tree Analysis |  UX Research Surveys |  Operations MORT Analysis |  Operations 5 Whys |
|---|---|---|---|---|
Purposedifferent | 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 topic needs to be validated broadly and many people can answer the same question, surveys gather structured feedback in a scalable form. Answers become comparable and segmentable instead of remaining merely anecdotal. | 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. | 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. |
Complexitydifferent | High | Medium | High | Low |
Timedifferent | 2-6 h | 3-14 Tage | Mehrere Tage bis Wochen | 15-30 min |
Participantsdifferent | 3-8 | 50+ | 2-6 | 2-6 |
Formatdifferent | Workshop + async | Async | Workshop + async | Workshop |
Outputdifferent | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Survey Results, Charts, Segment Insights | MORT Worksheets, Findings per Branch, Corrective Actions, Systemic Recommendations | Root cause notes, Countermeasures |
Tagsno overlap | RiskRoot causeSafety | QuantitativeResearchValidation | Root causeSafetySystemicIncident | Root causeIncidentLeanProblem solving |