This purpose of this study was to explore the differences between mixed and single race students in the factors that contribute to an interpersonal self-concept. The data in this study are drawn from a national longitudinal survey, Your First College Year (YFCY), from 2004-2005 and includes mixed race Black and Asian students in comparison to their single race Black and Asian single race peers to explore interpersonal self-concept. The results suggest that mixed and single race Asian and Black students have different pre-college and first year experiences. Only mixed race Black students were found to develop a significantly higher interpersonal self-concept after their first-year than their single race peers. However, most importantly for mixed and single race students are their interactions with diverse peers. For all groups, both negative and positive interactions based on race within the college environment directly impact interpersonal self-concept. First-year college experiences (Positive Ethnic/Racial Relations, Racial Interactions of a Negative Quality, Leadership Orientation, Sense of Belonging, Campus Racial Climate, Self-Assessed Cognitive Development) were the most significant contributors to the development of an interpersonal self-concept in comparison to pre-college experiences. The slight differences between Black and Asian interpersonal self-concept are discussed. The findings in this study expand the literature on multiracial college students and provide empirical evidence to support institutional practices that aim to promote a positive interpersonal self-concept in the first college year. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]