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| Criterion |  Operations 5 Whys |  Operations Scatter Diagram |  Operations Barrier Analysis |  Operations Root Cause Tree Analysis |
|---|---|---|---|---|
Purposedifferent | 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. | When the question is whether two measures are related, the method makes patterns in the data picture visible. It separates felt correlations from relationships that actually show up in the data. | 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 | Low | Low | Medium | Medium |
Timedifferent | 15-30 min | 30-90 min | 2-4 h | 1-3 h |
Participantsdifferent | 2-6 | 1-4 | 2-6 | 2-8 |
Formatdifferent | Workshop | Workshop + async | Workshop + async | Workshop |
Outputdifferent | Root cause notes, Countermeasures | Scatter Plot, Korrelationsnotiz, Hypothesenliste | Barrier Inventory, Failure Analysis per Barrier, Action Backlog | Cause Tree, Evidence Notes, Countermeasures |
Tags1 shared | Root causeIncidentLeanProblem solving | Root causeQualityVisualization | Root causeSafetyIncident | Root causeTreeIncidentQuality |