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| Criterion |  Operations 5 Whys |  Operations Family Tree Analysis |  Operations Root Cause Analysis |  Operations A3 Problem Solving |
|---|---|---|---|---|
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 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. | When a problem keeps recurring and the cause stays unclear, the method exposes the underlying mechanism. It separates symptom, guess, and robust explanation from one another. | 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. |
Complexitydifferent | Low | Medium | Medium | Medium |
Timedifferent | 15-30 min | 2-4 h | 1-4 h | 45-90 min |
Participantsdifferent | 2-6 | 2-6 | 3-8 | 2-5 |
Formatdifferent | Workshop | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Root cause notes, Countermeasures | Family Tree Diagram, Pattern Notes, Systemic Measures | Problem Statement, Cause Hypotheses, Confirmed Causes, Action Plan | A3 Report, Action Plan, Root Cause Analysis |
Tagsno overlap | Root causeIncidentLeanProblem solving | Root causePatternsIncidentSystemic | Root causeProblem solvingQualityIncident | LeanProblem solvingCoachingOperations |