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| Criterion |  Operations 8D Problem Solving |  Operations Failure Mode and Effects Analysis |  Decision Making Assumption Surfacing |  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 process, product, or service with noticeable failure risks, the method assesses possible failure modes in advance. It directs attention to combinations of occurrence, effect, and detectability. | Plans often contain assumptions that were never openly stated and remain dangerous precisely because of that. Assumption Surfacing makes these silent premises visible and prioritizes which of them carry the initiative or could sink it. | 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 | High | Low | Low |
Timedifferent | 1-6 Wochen | 2-6 h | 45-90 min | 15-30 min |
Participantsdifferent | 4-10 | 3-10 | 2-8 | 2-6 |
Formatdifferent | Workshop + async | Workshop | Workshop + async | Workshop |
Outputdifferent | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | FMEA Table, Risk Priority, Mitigation Actions | Assumption List, Critical Assumptions, Learning Plan | Root cause notes, Countermeasures |
Tagsno overlap | QualityProblem solvingRoot cause | RiskQualityOperationsRoot cause | AssumptionsRiskDecisionDiscovery | Root causeIncidentLeanProblem solving |