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| Criterion |  Operations 8D Problem Solving |  Operations Waste Analysis |  Operations Barrier Analysis |  Operations Root Cause Tree Analysis |
|---|---|---|---|---|
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 that keeps people busy but creates little value, the method exposes waste. It directs attention to unnecessary movement, waiting times, rework, and overdelivery. | 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. | For a problem with several suspected causes, the method builds a causal structure instead of a mere list. It makes visible how causes connect and where the strongest points of leverage lie. |
Complexitydifferent | High | Low | Medium | Medium |
Timedifferent | 1-6 Wochen | 45-120 min | 2-4 h | 1-3 h |
Participantsdifferent | 4-10 | 2-8 | 2-6 | 2-8 |
Formatdifferent | Workshop + async | Workshop | Workshop + async | Workshop |
Outputdifferent | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | Waste Map, Prioritized Waste, Improvement Backlog | Barrier Inventory, Failure Analysis per Barrier, Action Backlog | Cause Tree, Evidence Notes, Countermeasures |
Tagsno overlap | QualityProblem solvingRoot cause | WasteLeanProcess improvement | Root causeSafetyIncident | Root causeTreeIncidentQuality |