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| Criterion |  Product Discovery Solution Interview |  Operations 5 Whys |  Innovation Design Sprint |  Operations 8D Problem Solving |
|---|---|---|---|---|
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 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. | When the product question is unclear and time pressure is high, the method takes a team from an open idea to a testable solution. It connects problem understanding, decision, and learning in one compact format, lowering the risk of spending a lot of energy on a mere guess. | 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 | Medium | Low | High | High |
Timedifferent | 30-60 min je Interview | 15-30 min | 4-5 Tage | 1-6 Wochen |
Participantsdifferent | 5-10 Interviews | 2-6 | 5-8 | 4-10 |
Formatdifferent | Workshop + async | Workshop | Workshop | Workshop + async |
Outputdifferent | Solution Feedback, Objection List, Validation Notes | Root cause notes, Countermeasures | Prototype, Test Findings, Decision Rationale | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan |
Tagsno overlap | ValidationInterviewsPrototype | Root causeIncidentLeanProblem solving | Design sprintPrototypeValidationInnovation | QualityProblem solvingRoot cause |