http://www.bnet.com/blog/business-strategy/three-ways-to-make-your-team-smarter/892?promo=713&tag=nl.e713

• Social sensitivity of group members: Teams in which members understood each others’ mood did better than teams that lacked that sensitivity.
• Equality in distribution of conversational turn-taking: The groups where a few people dominated the conversation were less collectively intelligent than those where participants more equally shared the floor.
• The proportion of women in the group: The researchers thought that this finding might be connected to the other two, since women tended to do better on sensitivity tests and be good at taking turns.