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| Criterion |  Operations 5 Whys |  Systems Thinking Stock and Flow Diagram |  Operations 8D 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. | A Stock and Flow Diagram shows how stocks, inflows, and outflows shape a system over time. It is especially suited when growth, delays, or capacity limits determine the dynamics. | For an acute quality or delivery problem, the method structures immediate protection and root cause work together. It keeps the situation stable while the actual cause is investigated cleanly. |
Complexitydifferent | Low | High | High |
Timedifferent | 15-30 min | 2-6 h | 1-6 Wochen |
Participantsdifferent | 2-6 | 1-6 | 4-10 |
Formatdifferent | Workshop | Workshop + async | Workshop + async |
Outputdifferent | Root cause notes, Countermeasures | Stock and Flow Model, Dynamics Notes, Simulation Hypotheses | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan |
Tagsno overlap | Root causeIncidentLeanProblem solving | DynamicsSimulationFeedbackSystems thinking | QualityProblem solvingRoot cause |
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