We are conducting a cluster-randomized trial in health practices in Georgia and Florida, to test the effectiveness of a decision aid (video + brochures) for increasing adherence to CRC screening guidelines. Thirty-two large group practices were recruited and randomized to receive usual care (routine reminders) or an evidence-based decision aid intervention. In each practice, patients between the ages of 52 and 75, without current CRC screening history, were enrolled into the study.