Laboratory studies have shown that decision-making groups tend to focus on common information at the expense of unique information. In the current study, high level business executives completed a personnel selection task. Access to information about the candidates was not controlled as in a...

Daan van Knippenberg is Professor of Organizational Behavior at RSM Erasmus University, Erasmus University Rotterdam, The Netherlands. His research interests include work group performance, especially work group diversity and group decision making, leadership, in particular the roles of self and...