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| Criterion |  Agile Three Amigos |  Operations Failure Mode and Effects Analysis |  Operations Fishbone Diagram |  Operations Fault Tree Analysis |
|---|---|---|---|---|
Purposedifferent | When story, test, and implementation could drift apart, it brings business perspective, engineering, and quality together early. It prevents a story from being read differently only late in the process. | 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 a problem has several possible contributing factors, the method sorts causes by cause areas. It prevents an initial hunch from blocking the view of other plausible drivers. | 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. |
Complexitydifferent | Low | High | Low | High |
Timedifferent | 15-30 min | 2-6 h | 30-60 min | 2-6 h |
Participantsdifferent | 3 | 3-10 | 2-8 | 3-8 |
Formatdifferent | Workshop + async | Workshop | Workshop | Workshop + async |
Outputdifferent | Clarified Story, Test Examples, Open Questions | FMEA Table, Risk Priority, Mitigation Actions | Fishbone Diagram, Cause Categories, Investigation Backlog | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions |
Tagsno overlap | CollaborationBehavior-Driven DevelopmentQualityRefinement | RiskQualityOperationsRoot cause | Root causeQualityOperations | RiskRoot causeSafety |