Group behavior is the interaction between individuals of a collective and the processes such as opinions, attitudes, growth, feedback loops, and adaptations that occur and change as a result of this interaction. The interactions serve to fulfill some need satisfaction of an individual who is part of the collective and helps to provide a basis for his interaction with specific members of the group.
A specific area of research in group behavior is the dynamics of teams. Team effectiveness refers to the system of getting people in a company or institution to work together effectively. The idea behind team effectiveness is that a group of people working together can achieve much more than if the individuals of the team were working on their own.