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| Criterion |  Operations Fault Tree Analysis |  Delivery Value Stream Mapping |  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 delivery work dissolves into wait times, handoffs, and hidden effort, Value Stream Mapping makes the actual flow visible. The method exposes bottlenecks, idle time, and feedback loops so lead time and improvement levers become tangible. | 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 |
Timedifferent | 2-6 h | 1-3 h | 15-30 min |
Participantsdifferent | 3-8 | 4-10 | 2-6 |
Formatdifferent | Workshop + async | Workshop | Workshop |
Outputdifferent | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Current-state map, Future-state map, Bottleneck list | Root cause notes, Countermeasures |
Tagsno overlap | RiskRoot causeSafety | LeanFlowWasteDelivery | Root causeIncidentLeanProblem solving |
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