Further, the centrality of specific developmental tasks varies with early, middle, and late periods of the transition. During the early adolescent years young people make their first attempts to leave the dependent, secure role of a child and to establish themselves as unique individuals, independent of their parents. Early adolescence is marked by rapid physical growth and maturation. The focus of adolescents' self-concepts are thus often on their physical self and their evaluation of their physical acceptability. Early adolescence is also a period of intense conformity to peers.
Middle adolescence is marked by the emergence of new thinking skills.
The intellectual world of the young person is suddenly greatly expanded. Although peers still play an important role in the life of middle adolescents, they are increasingly self-directed. Their concerns about peers are more directed toward their opposite sexed peers. It is also during this period that the move to establish psychological independence from one's parents accelerates. Much of their psychological energies are directed toward preparing for adult roles and making preliminary decisions about vocational goals.