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| Criterion |  Operations Fault Tree Analysis |  Operations Failure Mode and Effects Analysis |  Product Discovery Assumption Mapping |  Operations Fishbone Diagram |
|---|---|---|---|---|
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 process, product, or service with noticeable failure risks, the method assesses possible failure modes in advance. It directs attention to combinations of occurrence, effect, and detectability. | When assumptions still sit unordered in the room, it weighs uncertainty against leverage. It makes visible which hypotheses should be checked first. | When a problem has several possible contributing factors, the method sorts causes by cause areas. It prevents an initial hunch from blocking the view of other plausible drivers. |
Complexitydifferent | High | High | Medium | Low |
Timedifferent | 2-6 h | 2-6 h | 45-60 min | 30-60 min |
Participantsdifferent | 3-8 | 3-10 | 2-8 | 2-8 |
Formatdifferent | Workshop + async | Workshop | Workshop + async | Workshop |
Outputdifferent | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | FMEA Table, Risk Priority, Mitigation Actions | Assumption map, Test backlog, Risk ranking | Fishbone Diagram, Cause Categories, Investigation Backlog |
Tagsno overlap | RiskRoot causeSafety | RiskQualityOperationsRoot cause | AssumptionsRiskExperimentsValidation | Root causeQualityOperations |