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| Criterion |  DevOps Blameless Postmortem |  DevOps ChatOps |  Systems Thinking Iceberg Model |  Operations Barrier Analysis |
|---|---|---|---|---|
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 operational work in a distributed team, the method links communication with direct system control. It records decisions right where the signal, the context, and the execution come together. | The Iceberg Model separates visible events from patterns, structures, and mental models. This turns a single observation into a deeper understanding of why a problem keeps recurring. | 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 | Medium | Medium | Low | Medium |
Timedifferent | 30-90 min | Ongoing | 30-60 min | 2-4 h |
Participantsdifferent | 3-12 | 2-20 | 2-10 | 2-6 |
Formatsame | Workshop + async | Workshop + async | Workshop + async | Workshop + async |
Outputdifferent | Postmortem Doc, Action Items, Timeline | Chat Transcript, Action Log, Automations | Iceberg Worksheet, Pattern Notes, Intervention Ideas | Barrier Inventory, Failure Analysis per Barrier, Action Backlog |
Tagsno overlap | Site Reliability EngineeringIncidentLearningReliability | CollaborationEngineeringIncident | Systems thinkingRoot causePatterns | Root causeSafetyIncident |