Peer-Led Study Groups provide an opportunity for students who are enrolled in introductory science courses to study and interact with peers. The weekly meetings are designed to involve all group members and are not meant to be tutoring sessions or review sessions controlled by group leaders. Leaders use facilitation techniques to engage the members, encouraging them to teach and learn from each other. Study Group membership is voluntary, but members are required to attend regularly and participate actively. With access to a sufficient number of classroom response units (clickers), the trainers of the Peer Leaders and the Leaders themselves would be able to integrate this relatively easy-to-use tool into the active learning sessions they create. New Study Group Leaders (up to 120 students per term) participate in an initial 5-hour training session and then attend monthly two-hour training sessions for the remainder of the the term, along with returning Leaders.