of Sciences, Warsaw, Poland'
- 'Department of Psychology, University of Warsaw, Warsaw, Poland'
- 'Interdisciplinary Centre for Mathematical and Computational Modelling, University of Warsaw, Pawińskiego 5a, 02-106 Warsaw, Poland'
author:
- 'Piotr Migda[ł]{}'
- 'Joanna Rączaszek-Leonardi'
- 'Micha[ł]{} Denkiewicz'
- Dariusz Plewczynski
title: 'Information-sharing and aggregation models for interacting minds'
---

group decision making ,two-alternative forced choice ,decision aggregation ,group information processing ,discriminative judgments ,accuracy ,discrimination difficulty ,bias ,information sharing ,group size ,two-choice decision ,distributive cognitive systems ,communication models ,cognitive process modeling

Introduction
============

Anyone who has ever taken part in group decision making or problem solving has most likely asked themselves at one point or another whether the process actually made any sense. Would it not be better if the most competent person in the group simply made the decision? In other words, it is an open question whether a group can ever outperform its most capable member. There have been many studies that have reported group decisions to be less accurate [@Corfman1995]. Some studies, however, have concluded that groups — even when they merely use simple majority voting — can make better decisions than their individual members [@Grofman1978; @Kerr2004; @Hastie2005]. We ask a more general question: how does 