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| Criterion |  Architecture arc42 |  Operations Change Analysis |  Operations Kepner-Tregoe |  Operations 5 Whys |
|---|---|---|---|---|
Purposedifferent | 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 deviation after a change, the method isolates the influence of the altered condition. It narrows down which differences are relevant and which are just accompanying noise. | For a disturbance that's hard to pin down, the method cleanly separates problem, cause, and decision. It reduces mixing when symptoms allow several interpretations. | 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 | Low | Medium | High | Low |
Timedifferent | 1-2 Tage | 45-120 min | 2-8 h | 15-30 min |
Participantsdifferent | 1-4 | 2-6 | 2-8 | 2-6 |
Formatdifferent | Workshop + async | Workshop + async | Workshop + async | Workshop |
Outputdifferent | Architecture Document, Context View, Runtime View, Deployment View | Change Matrix, Cause Hypotheses, Validation Questions, Action List | Problem Analysis, Decision Analysis, Risk Plan | Root cause notes, Countermeasures |
Tagsno overlap | ArchitectureDocumentationCommunication | ChangeRoot causeTroubleshootingComparison | Problem solvingRoot causeDecisionOperations | Root causeIncidentLeanProblem solving |