In this article, we attempt to distinguish between the properties of moderator and mediator variables at a number of levels. First, we seek to make theorists and researchers aware of the importance of not using the terms moderator and mediator interchangeably by carefully elaborating, both conceptually and strategically, the many ways in which moderators and mediators differ. We then go beyond this largely pedagogical function and delineate the conceptual and strategic implications of making use of such distinctions with regard to a wide range of phenomena, including control and stress, attitudes, and personality traits. We also provide a specific compendium of analytic procedures appropriate for making the most effective use of the moderator and mediator distinction, both separately and in terms of a broader causal system that includes both moderators and mediators.The purpose of this analysis is to distinguish between the properties of moderator and mediator variables in such a way as to clarify the different ways in which conceptual variables may account for differences in peoples' behavior. Specifically, we differentiate between two often-confused functions of third variables: (a) the moderator function of third variables, which partitions a focal independent variable into subgroups that establish its domains of maximal effectiveness in regard to a given dependent variable, and (b) the mediator function of a third variable, which represents the generative mechanism through which the focal independent variable is able to influence the dependent variable of interest.Although these two functions of third variables have a relatively long tradition in the social sciences, it is not at all uncommon for social psychological researchers to u, the terms moderator and mediator interchangeably. For example, Harkins, Latan6, and Williams 0980) first summarized the impact of identifiability on social loafing by observing that it "moderates social loafing" (p. 303) and then within the same paragraph proposed "that identifiability is an important mediator of social loafing: ' Similarly, Findley and Cooper (1983), intending a moderator interpretation, labeled gender, age, race, and socioeconomic level as mediators of the relation between locus of control and academic achievement. Thus, one largely pedagogiThis research was supported in part by National Science Foundation Grant BNS-8210137 and National Institute of Mental Health Grant R01 MH-40295-01 to the second author. Support was also given to him during his sabbatical year by the MacArthur Foundation at the Center for Advanced Studies in the Behavioral Sciences, Stanford, California.Thanks are due to Judith Harackiewicz, Charles Judd, Stephen West, and Harris Cooper, who provided comments on an earlier version of this article. Stephen P. Needel was instrumental in the beginning stages of this work.Correspondence concerning this article should be addressed to Reuben M. Baron, Department of Psychology U-20, University of Connecticut, Storrs, Connecticut 06268. cal functi...