The smallest social unit is not an individual person, but rather, a person along with his or her social environment—with her most important family members, her friends, a few close co-workers. An individual cannot develop all by herself. Consequently, Moreno first conceived of psychodrama as a process of group psychotherapy; he researched the structures of relationships and described the way attraction, rejection, choice, interaction, cohesion and dynamics within a group become significant and operative factors for change. Psychodrama as individual therapy emerged only later. In psychotherapy with children and adolescents, special psychodrama settings have been developed for a variety of age groups, in which the children can use their own ‘language’—the language of play—in order to express themselves, to understand, to try out new things, and to grow from within. Psychodrama has become one of the most popular and effective approaches to working with children and adolescents in the German-speaking world.