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| Criterion |  Operations Fault Tree Analysis |  Operations 5 Whys |  Delivery Value Stream Mapping |
|---|---|---|---|
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. | 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. |
Complexitydifferent | High | Low | Medium |
Timedifferent | 2-6 h | 15-30 min | 1-3 h |
Participantsdifferent | 3-8 | 2-6 | 4-10 |
Formatdifferent | Workshop + async | Workshop | Workshop |
Outputdifferent | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Root cause notes, Countermeasures | Current-state map, Future-state map, Bottleneck list |
Tagsno overlap | RiskRoot causeSafety | Root causeIncidentLeanProblem solving | LeanFlowWasteDelivery |
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