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| Criterion |  Operations Fault Tree Analysis |  Operations Root Cause Analysis |  Facilitation Dot Estimation |  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 problem keeps recurring and the cause stays unclear, the method exposes the underlying mechanism. It separates symptom, guess, and robust explanation from one another. | When size or effort can only be estimated roughly, Dot Estimation condenses the group's experience into a quick range. It turns individual contributions into a visible selection. The result is captured as an Effort Heatmap, Risk Signals, and Discussion Targets. | 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 | Low | Low |
Timedifferent | 2-6 h | 1-4 h | 5-20 min | 15-30 min |
Participantsdifferent | 3-8 | 3-8 | 3-20 | 2-6 |
Formatdifferent | Workshop + async | Workshop + async | Workshop | Workshop |
Outputdifferent | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Problem Statement, Cause Hypotheses, Confirmed Causes, Action Plan | Effort Heatmap, Risk Signals, Discussion Targets | Root cause notes, Countermeasures |
Tagsno overlap | RiskRoot causeSafety | Root causeProblem solvingQualityIncident | EstimationEffortRisk | Root causeIncidentLeanProblem solving |