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| Criterion |  Operations 8D Problem Solving |  Operations A3 Problem Solving |  Facilitation Fishbowl Discussion |  Operations 5 Whys |
|---|---|---|---|---|
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 complex deviation with several people involved, the method bundles problem, analysis, and decision onto one page. It creates a shared working space where causes, countermeasures, and follow-up fit together. | When a controversial topic needs depth and discipline at the same time, Fishbowl Discussion makes the structure of the conversation transparent. The format keeps the core small enough for real dialogue and open enough for controlled turnover. | 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. |
Complexitydifferent | High | Medium | Medium | Low |
Timedifferent | 1-6 Wochen | 45-90 min | 45-90 min | 15-30 min |
Participantsdifferent | 4-10 | 2-5 | 8-80 | 2-6 |
Formatdifferent | Workshop + async | Workshop + async | Workshop | Workshop |
Outputdifferent | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | A3 Report, Action Plan, Root Cause Analysis | Discussion Insights, Observed Tensions, Follow-up Questions | Root cause notes, Countermeasures |
Tagsno overlap | QualityProblem solvingRoot cause | LeanProblem solvingCoachingOperations | FacilitationDialogueLarge group | Root causeIncidentLeanProblem solving |