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| Criterion |  Operations 8D Problem Solving |  Product Discovery Assumption Mapping |  Product Discovery Test Card |  Product Discovery Riskiest Assumption Test |
|---|---|---|---|---|
Purposedifferent | For an acute quality or delivery problem, the method structures immediate protection and root cause work together. It keeps the situation stable while the actual cause is investigated cleanly. | When assumptions still sit unordered in the room, it weighs uncertainty against leverage. It makes visible which hypotheses should be checked first. | The Test Card turns a critical assumption into a testable claim and specifies in advance which result counts as success. | When an idea hinges on one critical unknown, it prioritizes testing that exact piece of uncertainty first. It separates problem, assumption, solution, and evidence. The result is captured as a prioritized list of assumptions, a test plan, and a result report. |
Complexitydifferent | High | Medium | Low | Medium |
Timedifferent | 1-6 Wochen | 45-60 min | 20-35 min | 1-2 Wochen pro Iteration |
Participantsdifferent | 4-10 | 2-8 | 1-5 | 2-6 |
Formatsame | Workshop + async | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | Assumption map, Test backlog, Risk ranking | Test Card with a pre-set threshold | Prioritized Assumption List, Test Plan, Results Report |
Tagsno overlap | QualityProblem solvingRoot cause | AssumptionsRiskExperimentsValidation | ExperimentsValidationDiscoveryHypothesis | ExperimentsValidationDiscoveryAssumptions |