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| Criterion |  Operations 8D Problem Solving |  Innovation Lean Startup |  Operations 5 Whys |  Operations A3 Problem Solving |
|---|---|---|---|---|
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 uncertain business assumptions, the method forces the idea into contact with real market reactions early. It separates wishful picture, assumption, and observable behavior, so that learning becomes faster than planning. This translates uncertainty into measurable insight. | 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 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. |
Complexitydifferent | High | Medium | Low | Medium |
Timedifferent | 1-6 Wochen | Wochen bis Monate je Lernzyklus | 15-30 min | 45-90 min |
Participantsdifferent | 4-10 | 2-8 | 2-6 | 2-5 |
Formatdifferent | Workshop + async | Workshop + async | Workshop | Workshop + async |
Outputdifferent | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | Hypothesis list, MVPs, Learning reports, Pivot or persevere decision | Root cause notes, Countermeasures | A3 Report, Action Plan, Root Cause Analysis |
Tagsno overlap | QualityProblem solvingRoot cause | LeanStartupValidationMVP | Root causeIncidentLeanProblem solving | LeanProblem solvingCoachingOperations |