all the verbal and nonverbal messages shared with or among members of the group force that brings group members closer together the way a group interacts to achieve its goals a collection of three or more people formed to solve a problem the multiplying together that results in a combined effort greater then any other parts expectations for the way group members behave while in the group a group characterizesd by ethical goals, interdependence, cohesiveness, productive norms, accountability, and synergy a deterioration of mental effciency, reality testing and moral judgementthst results from in-group pressure to conform