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| Criterion |  DevOps Blameless Postmortem |  Operations Root Cause Tree Analysis |  Architecture Architecture Communication Canvas |  Operations 5 Whys |
|---|---|---|---|---|
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. | For a problem with several suspected causes, the method builds a causal structure instead of a mere list. It makes visible how causes connect and where the strongest points of leverage lie. | The Architecture Communication Canvas plans architecture communication so the right people receive the right message. The method turns technical complexity into deliberate communication design. | 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 | Medium | Medium | Medium | Low |
Timedifferent | 30-90 min | 1-3 h | 60-120 min | 15-30 min |
Participantsdifferent | 3-12 | 2-8 | 2-8 | 2-6 |
Formatdifferent | Workshop + async | Workshop | Workshop + async | Workshop |
Outputdifferent | Postmortem Doc, Action Items, Timeline | Cause Tree, Evidence Notes, Countermeasures | Communication Canvas, Stakeholder Messages, Architecture Communication Plan | Root cause notes, Countermeasures |
Tagsno overlap | Site Reliability EngineeringIncidentLearningReliability | Root causeTreeIncidentQuality | ArchitectureCommunicationStakeholdersCanvas | Root causeIncidentLeanProblem solving |