The purpose of this study was to investigate the impact of student-faculty informal interpersonal relationships on student's intellectual and personal development. An instrument developed by Pascarella and Terenzini (1977) based on Tinto's model, was applied on 252 students (100 males and 152 females) who were enrolled in bachelor programs at Ajman University, UAE during the second semester of 2004-2005. Student-faculty informal interpersonal relationships were measured in six components: academic integration, peer relations, social integration, informal faculty relations, faculty concern, and student commitment. Multivariate regression procedures were used to determine the extent to which social interaction can predict students' personal and intellectual development. Significant differences were found between males and females on their personal and intellectual development. Also, social interaction was able to explain 34% of the variance on students' intellectual development and 45% of the variance on their personal development. (Contains 5 tables.)