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| Criterion |  Operations Fault Tree Analysis |  UX Research User Interviews |  Operations Failure Mode and Effects Analysis |  UX Research Affinity Diagramming |
|---|---|---|---|---|
Purposedifferent | 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 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 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. |
Complexitydifferent | High | Low | High | Low |
Timedifferent | 2-6 h | 30–60 min per interview | 2-6 h | 45–90 min |
Participantsdifferent | 3-8 | 1 participant per interview | 3-10 | 3-10 |
Formatdifferent | Workshop + async | Workshop + async | Workshop | Workshop |
Outputdifferent | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Interview Notes, Themes, Insight Summary | FMEA Table, Risk Priority, Mitigation Actions | Theme clusters, Insight statements, Opportunity areas |
Tagsno overlap | RiskRoot causeSafety | QualitativeResearchCustomerDiscovery | RiskQualityOperationsRoot cause | SynthesisQualitativeRoot cause |