Comments that perhaps few psychologists would now describe themselves as strict behaviorists; however, a review of the literature suggests that methodological and radical behaviorism continue to exert a powerful influence on current research, even in such nominally cognitive areas as imagery and hypothesis learning. In many ways this influence has been healthy, leading to a productive emphasis on the importance of environmental variables in shaping behavior, but some of its consequences have been rather less benign. After reviewing the historical arguments (...) against the use of introspection, the author concludes that most either are invalid or no longer possess their original force, so the benefits from a wider use of introspection now seem likely to outweigh the possible costs. (shrink)