Developmental psychology is the scientific study of how and why human beings change over the course of their life. Originally concerned with infants and prepubescent children, the field has expanded to include adolescence, adult development, aging, and the entire lifespan. Developmental psychologists aim to explain how thinking, feeling, and behaviors change throughout life. This field examines change across three major dimensions: physical development, cognitive development, and social emotional development.Within these three dimensions are a broad range of topics including motor skills, executive functions, moral understanding, language acquisition, social change, personality, emotional development, self-concept, and identity formation.<br /><br />Developmental psychology examines the influences of nature and nurture on the process of human development, and processes of change in context across time. Many researchers are interested in the interactions among personal characteristics, the individual's behavior, and environmental factors, including the social context and the built environmen<br />Developmental psychology involves a range of fields, such as educational psychology, child psychopathology, forensic developmental psychology, and child development.<br /><br />Keywords: developmental , psychology , behavior, human beings<br />