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| Criterion |  Operations 5 Whys |  Operations Change Analysis |  Operations Kepner-Tregoe |  Operations Barrier 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. | For a deviation after a change, the method isolates the influence of the altered condition. It narrows down which differences are relevant and which are just accompanying noise. | For a disturbance that's hard to pin down, the method cleanly separates problem, cause, and decision. It reduces mixing when symptoms allow several interpretations. | 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. |
Complexitydifferent | Low | Medium | High | Medium |
Timedifferent | 15-30 min | 45-120 min | 2-8 h | 2-4 h |
Participantsdifferent | 2-6 | 2-6 | 2-8 | 2-6 |
Formatdifferent | Workshop | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Root cause notes, Countermeasures | Change Matrix, Cause Hypotheses, Validation Questions, Action List | Problem Analysis, Decision Analysis, Risk Plan | Barrier Inventory, Failure Analysis per Barrier, Action Backlog |
Tags1 shared | Root causeIncidentLeanProblem solving | ChangeRoot causeTroubleshootingComparison | Problem solvingRoot causeDecisionOperations | Root causeSafetyIncident |