Check-In/Check-Out is a secondary tier positive behavior support program in which an adult mentor is paired with a student to address problem behavior and support appropriate behavior. This case study extended the implementation of the Check-In/Check-Out strategy to a residential facility for students with emotional and behavioral disorders. The present study examines the relationship between the Check-In/Check-Out intervention and frequency of office discipline referrals, percentage of school-wide positive behavior support points earned, and academic performance. Results indicate a decrease in office discipline referrals and an increase in academic performance. Future investigation is warranted to evaluate the implementation of Check-In/Check-Out with students with emotional and behavioral disorders and in alternative education environments. (Contains 2 figures and 2 tables.)