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| Criterion |  UX Research Personas |  Decision Making Assumption Surfacing |  Operations 8D Problem Solving |  UX Research User Interviews |
|---|---|---|---|---|
Purposedifferent | 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. | Plans often contain assumptions that were never openly stated and remain dangerous precisely because of that. Assumption Surfacing makes these silent premises visible and prioritizes which of them carry the initiative or could sink it. | 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. |
Complexitydifferent | Medium | Low | High | Low |
Timedifferent | 1-3 Tage | 45-90 min | 1-6 Wochen | 30–60 min per interview |
Participantsdifferent | Internes Team | 2-8 | 4-10 | 1 participant per interview |
Formatsame | Workshop + async | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Persona Profiles, Needs Summary, Scenario Notes | Assumption List, Critical Assumptions, Learning Plan | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan | Interview Notes, Themes, Insight Summary |
Tagsno overlap | ResearchCustomerSynthesis | AssumptionsRiskDecisionDiscovery | QualityProblem solvingRoot cause | QualitativeResearchCustomerDiscovery |