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| Criterion |  Operations Fault Tree Analysis |  Agile Affinity Estimation |  Agile Ideal Days |  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. | When many tasks need to be classified quickly, it sorts them by perceived effort and similarity. It reduces the effort of fine-grained estimation for large volumes. | When effort needs to be thought of as real working time, it offers a simple common denominator for comparison. It sorts work by value, risk, and delivery ability. The result is captured as Ideal Day Estimates, Assumption Notes, and Capacity Caveats. | 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 | Low | Medium |
Timedifferent | 2-6 h | 30-90 min | 15-60 min | 2-4 h |
Participantsdifferent | 3-8 | 3-12 | 2-9 | 2-6 |
Formatdifferent | Workshop + async | Workshop | Workshop + async | Workshop + async |
Outputdifferent | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Affinity Size Map, Grouped Estimates, Unclear Items | Ideal Day Estimates, Assumption Notes, Capacity Caveats | Barrier Inventory, Failure Analysis per Barrier, Action Backlog |
Tagsno overlap | RiskRoot causeSafety | EstimationBacklogRelative sizing | EstimationEffortAgile | Root causeSafetyIncident |