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| Criterion |  DevOps Blameless Postmortem |  Architecture C4 Model |  Delivery Communication Plan |  DevOps Incident Command |
|---|---|---|---|---|
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. | When many people need to be informed in parallel and messages would otherwise arrive unevenly or too late, a Communication Plan orders communication reliably. Channels, audiences, and cadences interlock so important information doesn't get lost. | During an acute incident with several people involved, the method creates a clear leadership and communication structure. It reduces chaos when fast coordination and clean situational awareness are both needed at once. |
Complexitydifferent | Medium | Low | Low | Medium |
Timedifferent | 30-90 min | 1-4 h | 45-90 min | As needed |
Participantsdifferent | 3-12 | 1-5 | 2-6 | 4-15 |
Formatsame | Workshop + async | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Postmortem Doc, Action Items, Timeline | Context Diagram, Container Diagram, Component Diagram | Communication Plan, Channel Matrix, Message Cadence | Incident Log, Action Tracker, Stakeholder Updates |
Tagsno overlap | Site Reliability EngineeringIncidentLearningReliability | ArchitectureCommunicationVisualization | CommunicationStakeholdersDeliveryPlanning | IncidentOperationsReliability |