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| Criterion |  Operations 8D Problem Solving |  Product Discovery MVP Test Matrix |  Operations 5 Whys |  Product Discovery Learning Card |
|---|---|---|---|---|
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 several minimal variants compete to answer the same question, it makes comparing and choosing between them cleaner. It separates problem, assumption, solution, and evidence. The result is captured as a Test Matrix and a Test Plan. | 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 Learning Card connects traceable test results to a reasoned next action while keeping the limits of the insight visible. |
Complexitydifferent | High | Medium | Low | Low |
Timedifferent | 1-6 Wochen | 45-75 min | 15-30 min | 25-40 min |
Participantsdifferent | 4-10 | 2-8 | 2-6 | 1-5 |
Formatdifferent | Workshop + async | Workshop | Workshop | Workshop + async |
Outputdifferent | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | Test Matrix, Test Plan | Root cause notes, Countermeasures | Learning Card with evidence and next action |
Tagsno overlap | QualityProblem solvingRoot cause | ExperimentsValidationDiscoveryOptions | Root causeIncidentLeanProblem solving | ExperimentsValidationDiscoveryLearning |