Throwing people into a room and telling them they are a "team" will usually result in the opposite: people confined together who fight for their own space.  To relieve the natural frictions of people getting too close to each other, a "facilitator" is usually needed: who is expert in "people-process" for HOW people can pool their talents and knowledge to be more than any one of them can be by themselves.  Faciltiators are competent in the actual, practical METHODS for helping people listen to each other and contribute their best to the group objectives.  Having an ongoing training and support program for Facilitators in an organization can "grease the wheels" to allow much more progress than could be achieved by the standard mode of "win-lose" conflicts for doing business.  So when so-called "teams" crash and burn, consider adding trained facilitators to the mix of future teams.  It isn't the entire answer, but it's a big part of the solution.

Dan