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| Criterion |  Product Discovery Solution Interview |  Operations 8D Problem Solving |  Innovation Contradiction Analysis |  Operations 5 Whys |
|---|---|---|---|---|
Purposedifferent | When a solution idea is already on the table, it checks how it is understood and evaluated. It looks for resonance, objections, and missing fit early in the conversation. | 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. | 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. | 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. |
Complexitydifferent | Medium | High | Medium | Low |
Timedifferent | 30-60 min je Interview | 1-6 Wochen | 60-120 min | 15-30 min |
Participantsdifferent | 5-10 Interviews | 4-10 | 2-8 | 2-6 |
Formatdifferent | Workshop + async | Workshop + async | Workshop | Workshop |
Outputdifferent | Solution Feedback, Objection List, Validation Notes | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | Contradiction Statement, Abstraction Notes, Solution Principles, Concept Ideas | Root cause notes, Countermeasures |
Tagsno overlap | ValidationInterviewsPrototype | QualityProblem solvingRoot cause | ContradictionsInnovationProblem solving | Root causeIncidentLeanProblem solving |