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| Criterion |  Operations Fault Tree Analysis |  DevOps Blameless Postmortem |  Operations Failure Mode and Effects Analysis |  Operations Learning Review |
|---|---|---|---|---|
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 a process, product, or service with noticeable failure risks, the method assesses possible failure modes in advance. It directs attention to combinations of occurrence, effect, and detectability. | After a project phase with mixed results, the method makes learning from the individual case reusable. It connects events, decisions, and systemic conditions into robust insights. |
Complexitydifferent | High | Medium | High | Medium |
Timedifferent | 2-6 h | 30-90 min | 2-6 h | 1-3 h |
Participantsdifferent | 3-8 | 3-12 | 3-10 | 3-10 |
Formatdifferent | Workshop + async | Workshop + async | Workshop | Workshop |
Outputdifferent | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Postmortem Doc, Action Items, Timeline | FMEA Table, Risk Priority, Mitigation Actions | Learning Review Notes, System Factors, Improvement Actions |
Tagsno overlap | RiskRoot causeSafety | Site Reliability EngineeringIncidentLearningReliability | RiskQualityOperationsRoot cause | LearningRetrospectiveIncidentOperations |