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| Criterion |  Operations Gemba Walk |  Operations Barrier Analysis |  Operations Family Tree Analysis |  Operations Causal Factor Analysis |
|---|---|---|---|---|
Purposedifferent | When there is uncertainty about the real course of a process, the method brings observation to the place where work happens. It combines perception, follow-up questions, and process knowledge so decisions rest on actual workflows instead of assumptions. | 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 series of incidents with a similar pattern, the method arranges individual events as branches of a common origin. It makes visible which conditions keep recurring. | 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 | Low | Medium | Medium | High |
Timedifferent | 30-120 min | 2-4 h | 2-4 h | 2-6 h |
Participantsdifferent | 2-6 | 2-6 | 2-6 | 3-10 |
Formatdifferent | Workshop | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Observation Notes, Improvement Ideas | Barrier Inventory, Failure Analysis per Barrier, Action Backlog | Family Tree Diagram, Pattern Notes, Systemic Measures | Event Timeline, Causal Factor Chart, Cause List, Corrective Actions |
Tagsno overlap | LeanObservationProcessOperations | Root causeSafetyIncident | Root causePatternsIncidentSystemic | CausalityIncidentRoot causeTimeline |