Leads to ability to prioritize, a skill teens find difficult. Construction of a Sense of Personal Identity. Erik Erikson saw this as a life time task but also the defining developmental challenge of the teenage years. Need Formal Reasoning to intellectually pull together aspects of themselves into a coherent whole. Social aspects important- young people define themselves through memberships in groups.
Groups tend to be more inclusive during teenage years.
A discussion of the culturally determined ways different societies mark the passage of the young into sexual maturity can be interesting to students who have recently made the transition themselves. In the West, we tend to think of teenage as a recent social invention, but it is good to note that people in other times and places have commented on and created rituals around puberty. Barbel Inhelder was a colleague of Jean Piaget. She died in 1997. She worked with Jean Piaget for forty years and was a collaborator on several of his works.