The ego organization of the latency-age child is different from the ego organization of the adolescent and adult, so much so, in fact, that the symptoms and behavior that are a product of its function can be depended upon, to a large extent, to disappear with the transition to adolescent and adult ego forms. Also covered in this chapter are the shaping of certain problem areas; emotional imprinting leading to later psychopathology; the development of the superego; and the genesis of masochism. Because the operative organs for the discharge of aggression are much more developed during latency than are those for the sexual drive, teasing and rough fantasy play provide a good venue in the search for the antecedents and underpinnings of adolescent masochism.