Attending to instruction is a critical behavior for academic success. Many elementary school teachers, however, identify disruptive and inattentive classroom behaviors as key barriers to students' successful educational performance. This study examined the impact of two class-wide positive behavior support programs. The Mystery Motivator and "Get 'Em On Task" interventions were implemented in an alternating treatments design with fifth grade participants to decrease off-task behaviors. Results indicated that both interventions effectively decreased off-task behavior at the class-wide level. Implications and suggestions for future research on evidence-based behavioral interventions are discussed. (Contains 2 tables and 2 figures.)