From Sasha Dichter's post titled Four tips for better group decision making we find this interesting tidbit:

The Law of Two Women.  “One night I was having dinner with an executive at Google, and I asked him to tell me the most significant change he’s seen in how his company runs meetings.  Without hesitating, he told me they always make sure there is more than one woman in the room.  He then told me about the study that led to this principle…”  I won’t summarize the subsequent MIT study – the punchline is “groups that had a higher proportion of females were more effective.  These groups were more sensitive to input from everyone, more capable of reaching compromise, and more efficient at making decisions.”      This one is fascinating and, again, very easy to implement.