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| Criterion |  Operations 8D Problem Solving |  Operations 5 Whys |  Product Discovery Test Card |  Product Discovery Experiment Canvas |
|---|---|---|---|---|
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. | 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. | The Test Card turns a critical assumption into a testable claim and specifies in advance which result counts as success. | When experiments become unreadable after the fact, it arranges hypothesis, signal, and learning goal on a single canvas. It separates problem, assumption, solution, and evidence. The result is captured as a Completed Experiment Canvas and a Success Metric. |
Complexitydifferent | High | Low | Low | Low |
Timedifferent | 1-6 Wochen | 15-30 min | 20-35 min | 30-60 min |
Participantsdifferent | 4-10 | 2-6 | 1-5 | 1-5 |
Formatdifferent | Workshop + async | Workshop | Workshop + async | Workshop + async |
Outputdifferent | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | Root cause notes, Countermeasures | Test Card with a pre-set threshold | Completed Experiment Canvas, Success Metric |
Tagsno overlap | QualityProblem solvingRoot cause | Root causeIncidentLeanProblem solving | ExperimentsValidationDiscoveryHypothesis | ExperimentsValidationDiscoveryHypothesis |