This study investigated sex differences in counselor credibility as perceived by high school girls. A quasi-experimental method was used in which four tape recordings presented identical career information about women by female and male counselors. Fifty-three career-oriented and 53 home-oriented girls rated the counselor-narrators on a credibility questionnaire of 30, five-point semantic-differential scales. Null hypotheses tested: there is no difference (1) between credibility ratings given to female and male counselors; (2) between ratings of career-oriented and home-oriented girls; (3) in amount contributing to credibility ratings by three trait clusters: Expertness, Trustworthiness, and Sex-Role Stereotype. Analysis of variance was used to test for significance of differences between group means. All three null hypotheses were rejected. Results showed female, not male, counselors were rated higher for credibility; career-oriented girls counselors of both sexes higher than did home-oriented girls; of trait clusters contributing to overall credibility, Sex-Role Stereotype contributed less than Trustworthiness and Expertness. (Author)