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| Criterion |  UX Research User Interviews |  Operations Fault Tree Analysis |  UX Research Personas |  Operations Barrier Analysis |
|---|---|---|---|---|
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 critical top event with several possible triggers, the method logically models failure paths. It makes visible which combinations of conditions can lead to damage. | 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 a risk that can only be managed through multiple layers of protection, the method examines the effectiveness of each barrier. It shows where safeguards are missing, too weak, or fail under real conditions. |
Complexitydifferent | Low | High | Medium | Medium |
Timedifferent | 30–60 min per interview | 2-6 h | 1-3 Tage | 2-4 h |
Participantsdifferent | 1 participant per interview | 3-8 | Internes Team | 2-6 |
Formatsame | Workshop + async | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Interview Notes, Themes, Insight Summary | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Persona Profiles, Needs Summary, Scenario Notes | Barrier Inventory, Failure Analysis per Barrier, Action Backlog |
Tagsno overlap | QualitativeResearchCustomerDiscovery | RiskRoot causeSafety | ResearchCustomerSynthesis | Root causeSafetyIncident |