The purpose of the study was to determine the effectiveness of the Class-Wide Function-related Intervention Teams (CW-FIT) program, a group contingency intervention for whole classes, and for students with disruptive behaviors who are at risk for emotional/behavioral disorders (EBD). The CW-FIT program includes four elements designed from empirical studies on the assessment and treatment of problem behavior: (a) teaching socially appropriate communicative skills to access attention or brief escape; (b) extinction of or eliminating potential reinforcement (attention, escape) for problem behavior; (c) strengthening alternative or replacement behaviors, that is, differential reinforcement at individual levels within the context of peer groups with shared group contingencies; and (d) self-management for program maintenance. Procedures were designed to fit within a School-wide Positive Behavior Support framework as Tier II interventions. The CW-FIT implementation was completed in six classes drawn from three schools with 107 students and 8 target students with EBD risks. Results showed clinically important improvements. Group on-task data improved during CW-FIT over baseline levels. For target EBD risk students, results included decreased disruptive behaviors and increased on-task behavior during CW-FIT. Implications for teachers and practitioners are discussed; improved student behavior translates to important levels of increased instruction time in urban classrooms. (Contains 4 figures and 2 tables.)