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| Criterion |  Operations Fishbone Diagram |  Decision Making Assumption Surfacing |  Product Discovery Test Card |  Product Discovery Assumption Mapping |
|---|---|---|---|---|
Purposedifferent | 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. | Plans often contain assumptions that were never openly stated and remain dangerous precisely because of that. Assumption Surfacing makes these silent premises visible and prioritizes which of them carry the initiative or could sink it. | The Test Card turns a critical assumption into a testable claim and specifies in advance which result counts as success. | When assumptions still sit unordered in the room, it weighs uncertainty against leverage. It makes visible which hypotheses should be checked first. |
Complexitydifferent | Low | Low | Low | Medium |
Timedifferent | 30-60 min | 45-90 min | 20-35 min | 45-60 min |
Participantsdifferent | 2-8 | 2-8 | 1-5 | 2-8 |
Formatdifferent | Workshop | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Fishbone Diagram, Cause Categories, Investigation Backlog | Assumption List, Critical Assumptions, Learning Plan | Test Card with a pre-set threshold | Assumption map, Test backlog, Risk ranking |
Tagsno overlap | Root causeQualityOperations | AssumptionsRiskDecisionDiscovery | ExperimentsValidationDiscoveryHypothesis | AssumptionsRiskExperimentsValidation |