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| Criterion |  Engineering Fault Isolation |  Operations Barrier Analysis |  Operations Change Analysis |  Operations Causal Factor Analysis |
|---|---|---|---|---|
Purposedifferent | In technical failures, the visible symptom often gets mixed up with the actual cause. Fault Isolation narrows the fault space and progressively reduces which part of the system is truly affected. | 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 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 an event with a complicated course, the method breaks down the contributing factors along the timeline. It shows how conditions, decisions, and reactions together produce a course of events. |
Complexitydifferent | Medium | Medium | Medium | High |
Timedifferent | 30-180 min | 2-4 h | 45-120 min | 2-6 h |
Participantsdifferent | 1-6 | 2-6 | 2-6 | 3-10 |
Formatsame | Workshop + async | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Fault Isolation Map, Test Log, Excluded Hypotheses, Narrowed Fault Area | Barrier Inventory, Failure Analysis per Barrier, Action Backlog | Change Matrix, Cause Hypotheses, Validation Questions, Action List | Event Timeline, Causal Factor Chart, Cause List, Corrective Actions |
Tagsno overlap | TroubleshootingDiagnosisEngineering | Root causeSafetyIncident | ChangeRoot causeTroubleshootingComparison | CausalityIncidentRoot causeTimeline |