This paper serves as a "best practices guide" for researchers interested in applying intersectionality theory to psychological research. Intersectionality, the mutually constitutive relations among social identities, presents several issues to researchers interested in applying it to research. I highlight three central issues and provide guidelines for how to address them. First, I discuss the constraints in the number of identities that researchers are able to test in an empirical study, and highlight relevant decision rules. Second, I discuss when to focus on "master" identities (e.g., gender) versus "emergent" identities (i.e., White lesbian). Third, I argue that treating identity as a process situated within social structural contexts facilitates the research process. I end with a brief discussion of the implications for the study of intersectionality.
Although intersectionality has become part of the everyday lexicon, the field of psychology has demonstrated resistance to the theory, which we argue reflects epistemic exclusion. Epistemic exclusion is the devaluation of some scholarship as illegitimate and certain scholars as lacking credibility. We suggest that intersectionality has been epistemically excluded because it challenges dominant psychological norms about the scientific process and has been most readily endorsed by psychologists from marginalized groups. We provide evidence that epistemic exclusion has occurred through formal means (e.g., exclusion from mainstream journals) and informal processes (e.g., repeated misrepresentation of the theory). We use visibility theory to highlight the role of disciplinary power in this process, such that dominant psychologists act as gatekeepers. Finally, we discuss how the epistemic exclusion of intersectionality is a barrier to social issues scholarship and social justice in psychology, and offer structural recommendations for intersectionality's epistemic inclusion. Psychologists' awareness of intersectionality continues to grow as the tenets of the theory and the term itself form part of the everyday lexicon. Nevertheless, intersectionality scholars maintain
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