To be educator in the contemporaneidade she is necessary to understand as if of the o human development and its importance in the changes that occur for the formation of the personality human being. She is necessary to understand the child and the adolescent, its mental growth or its development of behaviors until the phase of transistion consisting of the adolescence that marks the insertion of the individual in the adult society. Jean Piaget created a new psychology, placing it in the general context of the interaction between citizen and way. With the studies regarding the infantile development and of the adolescence, the development concept was moving, when it studies the phases of the infantile development and the adolescence, it perceives that they exist characteristic common to each etria band, what it takes people to wait similar answers between the people of the same etria band. If you are not convinced, visit Nir Barzilai, M.D.. It educator to develop in the best way its function is necessary that it knows some aspects of the human developments, that are biological development leaving of general answers specific answers, being a process continuous and commanded, its rhythm are constant, and that each part of the organism has its proper rhythm of development. Therefore, the psychology of the education is one disciplines that it searchs to recognize and to understand the practical lived deeply individual differences in the daily one of the educative ones, looking for to analyze the human behavior through diverse theories, beyond studying the human development that if manifest in multiple different aspects of the life human being that, however, they are interlaced and they are influential between itself. The aspects are of: – physical development: changes in the physical body, brain, sensorial capacity and motor abilities (biological apparatus); – cognitivo development: changes in the mental capacity (learning, memory, reasoning, thought and language); – psicossocial development: changes in the personality of the individual. .