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| Criterion |  DevOps Blameless Postmortem |  Operations Fault Tree Analysis |  Operations Barrier Analysis |  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 critical top event with several possible triggers, the method logically models failure paths. It makes visible which combinations of conditions can lead to damage. | For a risk that can only be managed through multiple layers of protection, the method examines the effectiveness of each barrier. It shows where safeguards are missing, too weak, or fail under real conditions. | 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 | High | Medium | Low |
Timedifferent | 30-90 min | 2-6 h | 2-4 h | 15-30 min |
Participantsdifferent | 3-12 | 3-8 | 2-6 | 2-6 |
Formatdifferent | Workshop + async | Workshop + async | Workshop + async | Workshop |
Outputdifferent | Postmortem Doc, Action Items, Timeline | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Barrier Inventory, Failure Analysis per Barrier, Action Backlog | Root cause notes, Countermeasures |
Tagsno overlap | Site Reliability EngineeringIncidentLearningReliability | RiskRoot causeSafety | Root causeSafetyIncident | Root causeIncidentLeanProblem solving |