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| Criterion |  UX Research User Interviews |  UX Research Personas |  UX Research Affinity Diagramming |  Operations 8D Problem Solving |
|---|---|---|---|---|
Purposedifferent | 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 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. | When research notes, feedback, or observations sit unconnected side by side, affinity diagramming sorts the raw material into solid themes. Many individual points turn into patterns that make decisions and opportunities clearer. | 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 | Low | Medium | Low | High |
Timedifferent | 30–60 min per interview | 1-3 Tage | 45–90 min | 1-6 Wochen |
Participantsdifferent | 1 participant per interview | Internes Team | 3-10 | 4-10 |
Formatdifferent | Workshop + async | Workshop + async | Workshop | Workshop + async |
Outputdifferent | Interview Notes, Themes, Insight Summary | Persona Profiles, Needs Summary, Scenario Notes | Theme clusters, Insight statements, Opportunity areas | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan |
Tagsno overlap | QualitativeResearchCustomerDiscovery | ResearchCustomerSynthesis | SynthesisQualitativeRoot cause | QualityProblem solvingRoot cause |