When does a group become a team?

Not every Group of people will become a Team and often don't need to be! The appropriate approach for each can ensure time, effort and money is utilized effectively.
Groups are often Boards, Councils and Committees where the importance of individual performance is central to success. May share common vision or plan but success is determined by individual contributions rather than collective effort. 
Teams usually consist of people with a common goal(s) where the success of individuals are impacted by the collective performance of team and how they function together over a longer period of time.