Feedback is an essential tool for managing the cooperation in teams. Feedback is a give and take, both can and must be learned. The importance of feedback for personality development was also recognized in the 1970s by the two social psychologists Joseph Luft and Harry Ingram. They developed the so-called "Johari-window". It shows that self-perception and external perception differ. It also shows that through feedback the "blind spot" can be reduced and the scope for action increased. Positive feedback usually leads to the stabilization and development of the addressed behavior. It clears the way for team-promoting behavioral changes.