The concept of teaching and role of psychology in ensuring an efficient and effective teaching are explored. The application of psychological theories, such as Gagne’s phases of learning, Piaget’s constructivist approach, Skinner’s Operant conditioning (e. g. programmed learning), Bruner’s theories Vygotsky’s theory among others, is emphasized. Issues of instructional objectives, task analysis, reinforcement and punishment are highlighted. Issues of cultural diversity (adjustment), constructivism, motivation, class management, increasing, decreasing and maintaining behaviour, and self –control, are examined. Specific practical illustrations of common behaviour problems in schools, as well as ethnical issues are handled.