Adolescent Psychology ...do you want to know more about adolescent behaviour? Adolescence is often a very challenging time for both children and adults. Therefore, the study of the transition from childhood to adulthood has become an area of interest to psychologists and counsellors, as well as parents and teachers, as a means of understanding the emotional, physical, and psychological changes that take place at this important stage of an individual's development .The Adolescent Concept Adolescence and the idea of teenagers is a relatively new concept. Prior to education for all, people were adults or children. However, since the 1950s, the idea of a teenager has developed. Adolescence is a time of great transition, physically, mentally and emotionally for a child, as they move from childhood to adulthood.