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| Criterion |  Operations Fault Tree Analysis |  UX Research User Interviews |  Operations 8D Problem Solving |
|---|---|---|---|
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 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 | High | Low | High |
Timedifferent | 2-6 h | 30–60 min per interview | 1-6 Wochen |
Participantsdifferent | 3-8 | 1 participant per interview | 4-10 |
Formatsame | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Interview Notes, Themes, Insight Summary | 8D Report, Containment Plan, Root Cause Evidence, Corrective Action Plan |
Tagsno overlap | RiskRoot causeSafety | QualitativeResearchCustomerDiscovery | QualityProblem solvingRoot cause |
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Methods with strong topical overlap with the current selection, not yet in the comparison.
