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| Criterion |  Operations Fault Tree Analysis |  Architecture arc42 |  Operations 5 Whys |
|---|---|---|---|
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. | arc42 structures architecture knowledge so teams can document system, decisions, and risks consistently. The template builds a living understanding of the architecture instead of scattered notes. | For a single, hard-to-explain deviation, the method exposes the causal chain behind the visible symptom. It keeps the cause open until a controllable condition emerges instead of a mere description. |
Complexitydifferent | High | Low | Low |
Timedifferent | 2-6 h | 1-2 Tage | 15-30 min |
Participantsdifferent | 3-8 | 1-4 | 2-6 |
Formatdifferent | Workshop + async | Workshop + async | Workshop |
Outputdifferent | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Architecture Document, Context View, Runtime View, Deployment View | Root cause notes, Countermeasures |
Tagsno overlap | RiskRoot causeSafety | ArchitectureDocumentationCommunication | Root causeIncidentLeanProblem solving |
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