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| Criterion |  Operations Fault Tree Analysis |  Operations 5 Whys |  Decision Making PERT Estimation |
|---|---|---|---|
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. | 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. | On complex initiatives, a plain average tends to understate just how uncertain the outcome really is. It separates options, evaluation criteria, and open risks. The result is captured as a PERT Estimate, Expected Value, and Risk Notes. |
Complexitydifferent | High | Low | Medium |
Timedifferent | 2-6 h | 15-30 min | 15-45 min |
Participantsdifferent | 3-8 | 2-6 | 1-8 |
Formatdifferent | Workshop + async | Workshop | Workshop + async |
Outputdifferent | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Root cause notes, Countermeasures | PERT Estimate, Expected Value, Risk Notes |
Tagsno overlap | RiskRoot causeSafety | Root causeIncidentLeanProblem solving | EstimationUncertaintyRisk |
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