Belief Merging and Judgment Aggregation
Updated 2026-09-10
INTRODUCTION
English translation pending.
CORE DEFINITION
Belief merging and judgment aggregation study how a group synthesizes the views of its members into a collective judgment. Group decisions are often intricate because the issues are linked: a hiring committee must weigh teaching and research together, and a jury must decide each legal condition separately before concluding liability. The field asks which aggregation rules preserve consistency, and what they cost.
SCAFFOLDING EFFECT
Reduce cognitive load
- Spot the paradox: before voting, check the logical links between the propositions and anticipate contradiction. - Choose the rule: weigh proposition-wise majority against minimizing the total distance. - Fix the metric: require an explicit distance measure, which exposes the hidden weights.
Anchor fast decisions
The difficulty comes from logical links between issues: each member's judgment set is consistent, yet the proposition-wise majority outcome need not be. Distance-based approaches change the question: instead of voting issue by issue, they search all consistent judgment sets for the one that lies closest to the group's views. Consistency is then guaranteed, at the price of specifying in advance how distance is measured.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- plato.stanford.eduhttps://plato.stanford.edu/entries/belief-merging/verified
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