In this capstone work, Arthur Staats synthesises more than four decades of research, theory, and study into a new generation of behaviourism that offers insights and future directions for researchers, professionals, and students. Staats's unified theory of psychological behaviourism builds on current theories in child development, personality, psychological measurement, and abnormal behaviour. His theoretical model provides new ways to consider human behaviour as a whole that will have implications for research, theory, and practice.