Describes the Interpersonal Reactivity Index (IRI) and its relationships with measures of social functioning, self-esteem, emotionality, and sensitivity to others. 677 male and 667 female undergraduates served as Ss. Each of the 4 IRI subscales displayed a distinctive and predictable pattern of relationships with these measures, as well as with previous unidimensional empathy measures. Findings provide evidence for a multidimensional approach to empathy. (29 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved).