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| Criterion |  Agile Bucket System |  Knowledge Modeling IBIS |  Product Discovery Assumption Mapping |
|---|---|---|---|
Purposedifferent | 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. | IBIS structures thinking about complex questions as a sequence of issues, ideas, and arguments. The method keeps discussions open without forcing them into premature consensus. | When assumptions still sit unordered in the room, it weighs uncertainty against leverage. It makes visible which hypotheses should be checked first. |
Complexitysame | Medium | Medium | Medium |
Timedifferent | 30-90 min | 1-3 h | 45-60 min |
Participantsdifferent | 3-12 | 2-8 | 2-8 |
Formatdifferent | Workshop | Workshop + async | Workshop + async |
Outputdifferent | Bucketed Backlog, Relative Estimates, Split Candidates | Issue Map, Positions, Argument Notes | Assumption map, Test backlog, Risk ranking |
Tagsno overlap | EstimationBacklogRelative sizing | RationaleKnowledgeDecision | AssumptionsRiskExperimentsValidation |
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