The authors discuss the growing movement in the United States to develop expanded school mental health programs. These programs represent partnerships between schools and community mental health agencies to expand the range of mental health services provided by schools. Such programs emphasize effective prevention, assessment, and intervention. The authors describe efforts that have been undertaken to improve the fragmented and incomplete nature of children's services and to proactively identify and address children's emotional and behavioral problems. They also discuss a strategy to improve youth mental health programs, which includes needs assessments and an analysis of existing programs in a community. They describe the augmenting roles played by the mental health and public health systems in expanding and improving school-based mental health services. The authors outline steps to minimize or avoid the turfism and negative attitudes that may arise among professionals from different disciplines when they collaborate to expand and improve school-based programs.