High performance work teams don't just complete projects-- they complete them efficiently. Rather than work hard, they work smart, which means they improve the efficiency and overall value of the company for which they work.
High performance teams keep track of the big picture and set project goals accordingly. Every task a team carries out is a measurable step towards its goal, and the team does not take on a task that does not move the project forward.
A successful team is just that--a team. Members communicate effectively with one another and with other teams, and regular feedback sessions keep projects on track. Communication is an essential factor to a high performance work team's success; team members keep each other informed and work collaboratively.
An effective team interacts positively. Team members who treat each other with respect work together much more efficiently, as they are able to manage conflict in a productive manner.