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| Criterion |  Operations Fault Tree Analysis |  Agile Bucket System |  Agile Ideal Days |
|---|---|---|---|
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 a large batch of work needs a fast, rough estimate, it sorts items into predefined size buckets. It sorts work by value, risk, and delivery ability. The result is captured as a Bucketed Backlog, Relative Estimates, and Split Candidates. | 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. |
Complexitydifferent | High | Medium | Low |
Timedifferent | 2-6 h | 30-90 min | 15-60 min |
Participantsdifferent | 3-8 | 3-12 | 2-9 |
Formatdifferent | Workshop + async | Workshop | Workshop + async |
Outputdifferent | Fault Tree, Critical Paths, Cause Hypotheses, Control Actions | Bucketed Backlog, Relative Estimates, Split Candidates | Ideal Day Estimates, Assumption Notes, Capacity Caveats |
Tagsno overlap | RiskRoot causeSafety | EstimationBacklogRelative sizing | EstimationEffortAgile |
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Methods with strong topical overlap with the current selection, not yet in the comparison.
