Self-stereotyping, defined as the activation of stereotypes about oneself because of membership in a particular group, has been shown in certain situations to enhance or diminish cognitive performance. This study examined the effects of asking 1,107 African American and Caucasian American high school juniors from 22 schools to indicate their race/ethnicity at selected times before taking the ACT Assessment. The selected times included 2 weeks before testing and right before testing. Previous studies suggested that African American students would have diminished performance and that Caucasian American students would have enhanced performance if they were reminded of their ethnicity before testing. No significant differences were found between experimental groups who were asked their race/ethnicity before testing and control groups asked their race/ethnicity only after testing. An appendix contains the study questionnaires. (Author/SLD)