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| Criterion |  Operations 5 Whys |  Operations 8D Problem Solving |  Product Discovery Smoke Test |
|---|---|---|---|
Purposedifferent | 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. | 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 demand only needs to be roughly verified, it tests interest with minimal effort. It measures whether people would take a next step at all. |
Complexitydifferent | Low | High | Low |
Timedifferent | 15-30 min | 1-6 Wochen | 1-5 Tage |
Participantsdifferent | 2-6 | 4-10 | Nutzertraffic |
Formatdifferent | Workshop | Workshop + async | Async |
Outputdifferent | Root cause notes, Countermeasures | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | Interest Metrics, Conversion Signal, Learning Note |
Tagsno overlap | Root causeIncidentLeanProblem solving | QualityProblem solvingRoot cause | ValidationExperimentsDemandGrowth |
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Methods with strong topical overlap with the current selection, not yet in the comparison.
