ABSTRACT
This chapter argues that conduct has a structure and that the structure of conduct is the proper object of research and theory in experimental psychology. It discusses the content of natural domains in general and of the psychological domain in particular. The nonexperimental sciences deal with content. The experimental sciences concern themselves with the abstract entities that Whitehead called universals, eternal objects, and transcendent entities. The chapter discusses several traditions that distract us from the structure of the psychological domain. It distinguishes principles of psychological structure from the actual contingencies that have incremental or decremental effects under particular conditions. Actual contingencies of blame, praise, or social approval upon behavior have to do with the content of conduct. Acceptance of personal categories as psychology's basic classes encourages research based on the uncertain foundation of a weak system of classification.
