Abstract. Due to the increase in inflows mainly because of REUNI procedures and low completion rates observed at a Federal University, it is necessary to identify which courses may cause the students to remain in their programs longer than expected or even leaving the university before their conclusion. In this work, we suggest that the combinations of courses in a semester may not be appropriate thus causing a student retention. We present a case study on analyzing retention rules in all programs at a Federal University. With the results obtained by mining academic transcripts, we discuss how changes can be made in the flowchart so as to decrease the student retention rates.