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| Criterion |  UX Research Usability Testing |  Operations Kepner-Tregoe |  Innovation Design Sprint |  Operations 8D Problem Solving |
|---|---|---|---|---|
Purposedifferent | When a product is built but people get stuck on tasks, usability testing shows the friction at concrete points. Observed use instead of self-report makes visible where orientation, understanding, or interaction breaks down. | For a disturbance that's hard to pin down, the method cleanly separates problem, cause, and decision. It reduces mixing when symptoms allow several interpretations. | 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 | High | High | High |
Timedifferent | 1-2 h je Session | 2-8 h | 4-5 Tage | 1-6 Wochen |
Participantsdifferent | Based on research question | 2-8 | 5-8 | 4-10 |
Formatdifferent | Workshop + async | Workshop + async | Workshop | Workshop + async |
Outputdifferent | Usability Issues, Severity List, Recommendations | Problem Analysis, Decision Analysis, Risk Plan | Prototype, Test Findings, Decision Rationale | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan |
Tagsno overlap | ValidationUXPrototype | Problem solvingRoot causeDecisionOperations | Design sprintPrototypeValidationInnovation | QualityProblem solvingRoot cause |