The growing research literature on cognitive diversity in teams has multidisciplinary and international relevance. However, the varied conceptual and operational definitions restrict theory development and comparisons of empirical results. The purpose of the present article is to provide guidance for the systematic study of cognitive diversity and team functioning. We demonstrate that organization of the literature is necessary and offer an organizing heuristic based on the stability of the cognitive diversity conceptualization. Using this framework, we review the empirical findings for the effects of cognitive diversity on team criteria. Then, we address methodological issues and describe the manners in which cognitive diversity has been composed to the team level. Following each section we offer summary findings, critique the state of the literature, and offer guidance for future research. There are opportunities for researchers to enhance precision in theory and measurement and for integration across disciplines.