The document discusses the development of identity and self-concept during adolescence. It states that adolescence is a time when individuals develop a coherent personal identity and begin to question beliefs imposed by adults. They start to see themselves in more complex and abstract ways. The development of self-concept is complex, as multiple aspects of the self emerge. Understanding of self occurs in phases as adolescents describe themselves using different terms over time. Their self-esteem is dependent on peer acceptance and perceptions of their abilities. The formation of identity involves exploring roles and making commitments about one's identity.