While most philosophers and psychologists tend to believe that the rise of cognitive psychology has occurred concomitant with the decline of operant psychology, Terry L. Smith contends that nothing could be further from the truth. He maintains that operant psychology has discovered (and continues to discover) reasonably well-confirmed causal principles of intentional behavior, which go beyond what cognitive psychology can provide, while cognitive psychology, in tum, has the potential to supply analyses (and explanations) that account for them. Smith thus advances a surprising but nonetheless illuminating perspective for appreciating the place of operant conditioning within the discipline of psychology in this rich and fascinating work. J. H. F.