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| Criterion |  Operations 5 Whys |  Operations A3 Problem Solving |  Innovation Contradiction Analysis |  Operations Root Cause Analysis |
|---|---|---|---|---|
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 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. | When a system should improve while another measure suffers as a result, the method makes the underlying conflict precisely formulable. It separates the desired effect from its side effect. This makes solutions possible that address the contradiction deliberately instead of half-heartedly. | 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. |
Complexitydifferent | Low | Medium | Medium | Medium |
Timedifferent | 15-30 min | 45-90 min | 60-120 min | 1-4 h |
Participantsdifferent | 2-6 | 2-5 | 2-8 | 3-8 |
Formatdifferent | Workshop | Workshop + async | Workshop | Workshop + async |
Outputdifferent | Root cause notes, Countermeasures | A3 Report, Action Plan, Root Cause Analysis | Contradiction Statement, Abstraction Notes, Solution Principles, Concept Ideas | Problem Statement, Cause Hypotheses, Confirmed Causes, Action Plan |
Tags1 shared | Root causeIncidentLeanProblem solving | LeanProblem solvingCoachingOperations | ContradictionsInnovationProblem solving | Root causeProblem solvingQualityIncident |