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| Criterion |  Systems Thinking Future Reality Tree |  Operations 5 Whys |  Operations A3 Problem Solving |  Operations Barrier Analysis |
|---|---|---|---|---|
Purposedifferent | A Future Reality Tree shows how desired actions are meant to lead to a better system state. The method checks whether a path of change holds together logically before time flows into implementation. | 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 complex deviation with several people involved, the method bundles problem, analysis, and decision onto one page. It creates a shared working space where causes, countermeasures, and follow-up fit together. | 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 | High | Low | Medium | Medium |
Timedifferent | 2-4 h | 15-30 min | 45-90 min | 2-4 h |
Participantsdifferent | 3-8 | 2-6 | 2-5 | 2-6 |
Formatdifferent | Workshop | Workshop | Workshop + async | Workshop + async |
Outputdifferent | Future Reality Tree, Negative Branches, Assumption List, Improved Injections | Root cause notes, Countermeasures | A3 Report, Action Plan, Root Cause Analysis | Barrier Inventory, Failure Analysis per Barrier, Action Backlog |
Tagsno overlap | Theory of ConstraintsSystems thinkingChange | Root causeIncidentLeanProblem solving | LeanProblem solvingCoachingOperations | Root causeSafetyIncident |