Team cohesion develops in same department over time. Social scientists have explained the phenomenon of group cohesiveness in different ways. Some suggest that cohesiveness among group members develops from a heightened sense of belonging, as well as from collaboration and interdependence. Others note that cohesion comes from the interpersonal and group-level attraction common between people who shares similar backgrounds and interests. Because teams have clear boundaries regarding membership, barriers to belonging also contribute to cohesion.