Here is some great advice from the authors of the book, Light A Fire Under Your Business, about high-performance teams:
Once you have developed teamwork within a group, synergy is born. But it is the mission that creates motivation, an essential ingredient in high-performance teamwork. High-performance teams must have a common purpose to experience the motivation to achieve shared success.
When team members share a duty to serve a stated mission and respond in like fashion, they create motivation in each other. One of the greatest elements of a well-written mission statement is that every person on your team will use it as the same foundation for decision making. Regardless of his or her specific responsibilities or status on the team or in the organization, everyone is motivated by the same mission but from a different perspective.