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| Criterion |  Operations 5 Whys |  Operations Fault Tree 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. |
Complexitydifferent | Low | High |
Timedifferent | 15-30 min | 2-6 h |
Participantsdifferent | 2-6 | 3-8 |
Formatdifferent | Workshop | Workshop + async |
Outputdifferent | Root cause notes, Countermeasures | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions |
Tags1 shared | Root causeIncidentLeanProblem solving | RiskRoot causeSafety |
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