This article describes Prevent-Teach-Reinforce for Young Children (PTR-YC), a model based on extensive research that is designed for feasibility and effectiveness for treating challenging behaviors in classroom settings. This model is designed to meet the needs of children with and without disabilities who engage in challenging behavior that interferes with their learning and social development. This article contains a description of the PTR-YC model and presents a case study demonstrating the use of the model in an early childhood educational setting. The case study illustrates the PTR-YC process as implemented by a school-based team and presents the effectiveness of the procedures. (author abstract)