Supplemental Instruction (SI) is a free academic program designed to help students succeed in historically difficult courses. The program provides relaxed, peer-assisted study sessions led by students who have successfully completed the course in a previous semester and want to help other students excel. SI is a non-remedial approach that provides regularly scheduled sessions outside of class during which students work collaboratively to improve retention, discuss complex topics, and prepare for tests. The goal of SI is to help students integrate course content and study skills while working together. SI Leader are students who have already taken the class and succeeded. Leaders attend all class lectures, take notes, and guide sessions. Leaders guide sessions and prepare practice tests for students prior to each exam.