Beginning of Essay
The period of is most clearly defined by Jean Piaget and his definition, the formal-Operations stage. One of Piaget's four stages of Cognitive Development, it involves characteristics of advanced reasoning, creativity, grasping of external concepts and thinking m ....

Middle of Essay
.... the approach of Jean Piaget, the period of can range between the ages of ten or eleven spanning up to the later teen years of seventeen or eighteen, and potentially later. Many people can confuse the pubescent stage to be the centre of an adolescents development. But as it is seen through Piaget's work with children, adolescents and the developmental stages they encounter, there is a great deal more to than mere physical changes a growing person go through. The Cognitive Development is of equal importance, and could be considered to play a superior part in terms of overall continued development of a person throughout the lifespan. Piaget theoris ....