The specificities of the adolescent period are completion of somatic, sexual, emotional, cognitive, intellectual and social maturation. After having coped with this "existential crisis", the adolescents is able to accept new roles, a new identity. Offer described and characterized in detail three types of normal development of adolescents: continual development, accelerated development and precocious development. From the aspect of child and adolescent psychiatry all three described types of development are found in mentally healthy subjects who take life as an open chance.