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| Criterion |  Operations Fault Tree Analysis |  DevOps Blameless Postmortem |  DevOps Incident Timeline Analysis |  Operations Barrier Analysis |
|---|---|---|---|---|
Purposedifferent | 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. | 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 an incident with an unclear sequence, the method makes the timeline precisely visible. It separates perception, reaction, and delay so cause and effect become more clearly readable. | 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. |
Complexitydifferent | High | Medium | Medium | Medium |
Timedifferent | 2-6 h | 30-90 min | 60-180 min | 2-4 h |
Participantsdifferent | 3-8 | 3-12 | 3-10 | 2-6 |
Formatsame | Workshop + async | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Postmortem Doc, Action Items, Timeline | Incident Timeline, Evidence Log, Delay Analysis, Improvement Actions | Barrier Inventory, Failure Analysis per Barrier, Action Backlog |
Tagsno overlap | RiskRoot causeSafety | Site Reliability EngineeringIncidentLearningReliability | IncidentTimelineSite Reliability Engineering | Root causeSafetyIncident |