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| Criterion |  Operations 8D Problem Solving |  Operations 5 Whys |  Growth A/B Testing |
|---|---|---|---|
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. | When two variants compete, discussions quickly decide by taste rather than effect. A/B Testing checks behavior under controlled conditions and separates real improvement from chance or expectation effects. |
Complexitydifferent | High | Low | High |
Timedifferent | 1-6 Wochen | 15-30 min | 1-4 Wochen |
Participantsdifferent | 4-10 | 2-6 | 1-6 |
Formatdifferent | Workshop + async | Workshop | Async |
Outputdifferent | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | Root cause notes, Countermeasures | Experiment results, Decision log, Learning summary |
Tagsno overlap | QualityProblem solvingRoot cause | Root causeIncidentLeanProblem solving | ExperimentsGrowthAnalyticsValidation |
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Methods with strong topical overlap with the current selection, not yet in the comparison.
