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| Criterion |  Product Discovery Solution Interview |  Operations 8D Problem Solving |  Innovation Design Thinking |  Operations Root Cause Analysis |
|---|---|---|---|---|
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. | For complex user problems with an uncertain cause, the method connects observation, interpretation, and experiment into a learning cycle. It keeps the focus on real needs and avoids premature solution language. This produces robust decisions for product and service. | 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 | Medium | High | High | Medium |
Timedifferent | 30-60 min je Interview | 1-6 Wochen | 1 Tag bis mehrere Wochen | 1-4 h |
Participantsdifferent | 5-10 Interviews | 4-10 | 4-10 | 3-8 |
Formatdifferent | Workshop + async | Workshop + async | Workshop | Workshop + async |
Outputdifferent | Solution Feedback, Objection List, Validation Notes | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | Problem Statement, Prototype, Test Learnings | Problem Statement, Cause Hypotheses, Confirmed Causes, Action Plan |
Tagsno overlap | ValidationInterviewsPrototype | QualityProblem solvingRoot cause | InnovationPrototypeResearch | Root causeProblem solvingQualityIncident |