Psychological essentialism is a cognitive bias through which human beings conceive the entities around them as having inner essences and basic natures. Social scientists routinely generate flawed inferences because their methods require the truth of psychological essentialism. This article develops set-theoretic analysis as a scientific-constructivist approach that overcomes the bias of psychological essentialism. With this approach, the “sets” of set-theoretic analysis are mental phenomena that establish boundaries and identify similarities and differences among entities whose natural kind composition is not known. (...) The approach is illustrated through a consideration of research on intelligence, race, and poverty in the United States. (shrink)

Professor Turner’s reply to my article focuses on the ways in which set-theoretic analysis can be used to help solve problems of causal heterogeneity in social science research. By contrast, I discuss the ways in which set-theoretic analysis can be used to help solve problems of conceptual heterogeneity. I identify conceptual heterogeneity as a ubiquitous problem that is disguised by psychological essentialism. The seriousness of this problem must be recognized for scholars to appreciate the advantages of constructivist set-theoretic analysis for (...) the social sciences. (shrink)