Make sure that the people at the top are working together and there aren't divisions of labor. Don't have people working in silos; have them working across the team.
Smaller groups of people can establish trusting relationships.
Teamwork requires some sacrifice up front; people who work as a team have to put the collective needs of the group ahead of their individual interests.
Teamwork is a strategic decision.
Team synergy has an extraordinary impact on business results.
People who have a sense of peace that their priorities are in the right place also have a sense of humility and a realistic view on life.