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| Criterion |  Operations 8D Problem Solving |  Operations Barrier Analysis |  Innovation Crazy 8s |  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 risk that can only be managed through multiple layers of protection, the method examines the effectiveness of each barrier. It shows where safeguards are missing, too weak, or fail under real conditions. | With only a few minutes available and a still-fuzzy solution search, the method forces a wide range of variants. It produces fast sketches before the first idea can settle in, making different directions directly comparable and open to further development. | 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 | Low | Low |
Timedifferent | 1-6 Wochen | 2-4 h | 8-15 min | 15-30 min |
Participantsdifferent | 4-10 | 2-6 | 1-10 | 2-6 |
Formatdifferent | Workshop + async | Workshop + async | Workshop | Workshop |
Outputdifferent | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | Barrier Inventory, Failure Analysis per Barrier, Action Backlog | Sketch Set, Idea Shortlist, Direction Options | Root cause notes, Countermeasures |
Tagsno overlap | QualityProblem solvingRoot cause | Root causeSafetyIncident | BrainstormingSketchingSpeedDivergenceDesign sprint | Root causeIncidentLeanProblem solving |