obstruct the achievement of each other's goals). Social interdependence may be differentiated from social dependence, independence, and helplessness. Social dependence exists when the goal achievement of Person A is affected by Person B's actions, but the reverse is not true. Social independence exists when the goal achievement of Person A is unaffected by Person B's actions and vice versa. Social helplessness exists when neither the person nor other can influence goal achievement.

Kurt Lewin proposed that the essence of a group is the