This article describes an extension of Marcia's (1966) Identity Status Interview into three interpersonal domains: friendships, dating, and sex roles. The Identity Status Interview method is assessed favorably in terms of identity theory, justification for the three new sections is provided on the basis of theory and research on sex differences in adolescent identity, and methodological refinements in the interview are described. A study is reported in which the extended interview was administered to 41 male and 40 female high school juniors and seniors. Average percentage of exact agreement for ratings of exploration, commitment, and identity status was over 70% when two coders were used and over 94% when the ratings of two out of three coders were used. It is concluded that this extended interview is psychometrically sound and provides a method for assessing interpersonal issues salient to contemporary adolescents.