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| Criterion |  UX Research User Interviews |  Operations Failure Mode and Effects Analysis |  UX Research Personas |  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. | For a process, product, or service with noticeable failure risks, the method assesses possible failure modes in advance. It directs attention to combinations of occurrence, effect, and detectability. | 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. | 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 | High | Medium | High |
Timedifferent | 30–60 min per interview | 2-6 h | 1-3 Tage | 1-6 Wochen |
Participantsdifferent | 1 participant per interview | 3-10 | Internes Team | 4-10 |
Formatdifferent | Workshop + async | Workshop | Workshop + async | Workshop + async |
Outputdifferent | Interview Notes, Themes, Insight Summary | FMEA Table, Risk Priority, Mitigation Actions | Persona Profiles, Needs Summary, Scenario Notes | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan |
Tagsno overlap | QualitativeResearchCustomerDiscovery | RiskQualityOperationsRoot cause | ResearchCustomerSynthesis | QualityProblem solvingRoot cause |