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Collective intelligence through aggregation.

Franz Dietrich1,2, Christian List3

  • 1Paris School of Economics , Paris, Île-de-France, France.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|April 16, 2026
PubMed
Summary
This summary is machine-generated.

Collective intelligence can be achieved through group decision-making, but aggregation methods face challenges like inconsistency and manipulation. The median method offers a reasonable approach for group judgments, balancing consistency and truth-tracking.

Keywords:
Condordet's jury theoremaggregationcollective agencycollective cognitioncollective intelligencejudgementssocial choice

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Area of Science:

  • Decision Sciences
  • Social Choice Theory
  • Collective Intelligence

Background:

  • Group decision-making involves aggregating individual judgments on complex issues.
  • Aggregation methods must address potential inconsistencies, strategic manipulation, and truth-tracking.

Purpose of the Study:

  • To investigate challenges in judgement aggregation for group decision-making.
  • To identify conditions for achieving consistent, non-manipulable, and truth-tracking collective judgments.
  • To explore the evolution of collective intelligence through aggregation.

Main Methods:

  • Analysis of judgement aggregation problems.
  • Development of impossibility and possibility theorems.
  • Evaluation of aggregation methods like median and average.

Main Results:

  • Aggregation methods can lead to inconsistent collective judgments.
  • Many aggregation methods are susceptible to strategic voting.
  • New theorems identify requirements for consistent, non-manipulable, and truth-tracking aggregation.
  • The median method demonstrates reasonable performance.

Conclusions:

  • Achieving collective intelligence requires careful consideration of aggregation methods.
  • The median method is a practical, albeit imperfect, approach for group judgments.
  • Findings are relevant for both human and non-human collective decision-making.