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| Criterion |  Operations 8D Problem Solving |  UX Research User Interviews |  UX Research Empathy Mapping |  UX Research Personas |
|---|---|---|---|---|
Purposedifferent | 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 teams derive needs only from assumptions and real motives are missing, user interviews give direct access to behavior and meaning. Conversations from the target group's everyday life make patterns, tensions, and open questions solidly visible. | When a lot is assumed about a target group but little is seen jointly, empathy mapping makes knowledge and gaps directly comparable. The picture also shows which assumptions hold up and where evidence is missing. | When target groups stay too vague and teams talk about the same people differently, personas create a shared, solid picture of usage. Condensed profiles make needs, contexts, and differences tangible enough for decisions. |
Complexitydifferent | High | Low | Low | Medium |
Timedifferent | 1-6 Wochen | 30–60 min per interview | 30–60 min | 1-3 Tage |
Participantsdifferent | 4-10 | 1 participant per interview | 4-8 | Internes Team |
Formatdifferent | Workshop + async | Workshop + async | Workshop | Workshop + async |
Outputdifferent | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | Interview Notes, Themes, Insight Summary | Empathy Map, Assumptions List, Research Gaps | Persona Profiles, Needs Summary, Scenario Notes |
Tagsno overlap | QualityProblem solvingRoot cause | QualitativeResearchCustomerDiscovery | SynthesisQualitativeWorkshop | ResearchCustomerSynthesis |