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| Criterion |  Operations Fault Tree Analysis |  Operations 8D Problem Solving |  Agile Bucket System |  Operations 5 Whys |
|---|---|---|---|---|
Purposedifferent | For a critical top event with several possible triggers, the method logically models failure paths. It makes visible which combinations of conditions can lead to damage. | 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. | When a large batch of work needs a fast, rough estimate, it sorts items into predefined size buckets. It sorts work by value, risk, and delivery ability. The result is captured as a Bucketed Backlog, Relative Estimates, and Split Candidates. | 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 | Medium | Low |
Timedifferent | 2-6 h | 1-6 Wochen | 30-90 min | 15-30 min |
Participantsdifferent | 3-8 | 4-10 | 3-12 | 2-6 |
Formatdifferent | Workshop + async | Workshop + async | Workshop | Workshop |
Outputdifferent | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | Bucketed Backlog, Relative Estimates, Split Candidates | Root cause notes, Countermeasures |
Tagsno overlap | RiskRoot causeSafety | QualityProblem solvingRoot cause | EstimationBacklogRelative sizing | Root causeIncidentLeanProblem solving |