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| Criterion |  Knowledge Modeling Teach-back |  Operations 5 Whys |  DevOps Blameless Postmortem |  Operations Barrier Analysis |
|---|---|---|---|---|
Purposedifferent | Teach-back checks whether an explanation actually got through to the other person. The method makes misunderstandings visible early and strengthens shared understanding in advisory and learning situations. | 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. | 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 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 | Low | Low | Medium | Medium |
Timedifferent | 5-20 min | 15-30 min | 30-90 min | 2-4 h |
Participantsdifferent | 2-8 | 2-6 | 3-12 | 2-6 |
Formatdifferent | Workshop + async | Workshop | Workshop + async | Workshop + async |
Outputdifferent | Understanding Check, Clarification Notes, Learning Gaps | Root cause notes, Countermeasures | Postmortem Doc, Action Items, Timeline | Barrier Inventory, Failure Analysis per Barrier, Action Backlog |
Tagsno overlap | LearningUnderstandingCommunication | Root causeIncidentLeanProblem solving | Site Reliability EngineeringIncidentLearningReliability | Root causeSafetyIncident |