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| Criterion |  DevOps Blameless Postmortem |  Architecture C4 Model |  Operations A3 Problem Solving |
|---|---|---|---|
Purposedifferent | After an incident with damage or a near miss, the method creates a sober field for learning without assigning blame. It directs attention to the course of events, conditions, and effective countermeasures. | The C4 Model makes a system legible across several resolution levels, from context down to code. It suits situations where different audiences need to understand the same architecture from different altitudes. | For a complex deviation with several people involved, the method bundles problem, analysis, and decision onto one page. It creates a shared working space where causes, countermeasures, and follow-up fit together. |
Complexitydifferent | Medium | Low | Medium |
Timedifferent | 30-90 min | 1-4 h | 45-90 min |
Participantsdifferent | 3-12 | 1-5 | 2-5 |
Formatsame | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Postmortem Doc, Action Items, Timeline | Context Diagram, Container Diagram, Component Diagram | A3 Report, Action Plan, Root Cause Analysis |
Tagsno overlap | Site Reliability EngineeringIncidentLearningReliability | ArchitectureCommunicationVisualization | LeanProblem solvingCoachingOperations |
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