I. Purpose of paper: Child Psychology, study of children’s behavior-including physical, cognitive, motor, linguistic, perceptual, social, and emotional characteristics-from birth through adolescence. Child psychologists attempt to explain the similarities and differences among children and to describe normal as well as abnormal behavior and development. They also develop methods of treating social, emotional, and learning problems and provide therapy privately and in schools, hospitals, and other institutions. Two critical problems for child psychologists are (1) to determine how environmental variables (such as parental attitudes) a