This article reports the validity of the Questionnaire on Teacher Interaction (QTI), (developed to assess studentteacher interpersonal interaction) when modified, translated and used at the university level in Indonesia. We also investigated relationships between students' outcomes (achievement and attitudes) and the quality of teacher-student interactions among 422 students in 12 classes in a private university in Indonesia. Data analyses supported the QTI's validity, revealed differences between a computer science and a management department in terms of instructor-student interactions, and identified which types of instructor-student interactions are most likely to promote student outcomes at the university level.