In this article I discuss the factors that led me to implement study groups in the teaching of mathematics. An important influence in this decision began with an experimental study conducted with two College Algebra classes in which students were randomly assigned to treatment groups. While there was no statistical difference between the study groups on the posttest that was used to measure achievement, it is important to note the positive effect on the students. In addition, suggestions are given on how to implement cooperative study groups in your mathematics classroom.