In our large-enrollment (~900 students) general chemistry course, students are separated into several lectures of 150-250 students, but take common exams. As a way to offer additional help for all students as they prepare for the exams, we run review sessions outside of class time, when most students can attend. In prior years, these review sessions generally involved an instructor answering student questions and were poorly attended. Starting last year, the review session format was changed in an attempt to improve the effectiveness of the sessions. Review sessions now consist of a practice exam, where each student can use a personal response device (or �clicker�) to submit his/her answer. The amount of time spent on the explanation of each answer is directly related to the percentage of students who answered correctly.

This new approach has improved review session attendance dramatically. Currently, close to one-third of the students enrolled in the course attend the review sessions. Survey results show that more than 95% of the students say that the reviews helped them prepare for the exam. While the use of the clickers facilitated the new format, students rated the practice-quiz format itself as the most helpful feature of the review session.