The Teaching Tools for Young Children with Challenging Behavior (TTYC) presents a useful tool to disseminate evidence-based practices into the classroom setting for teachers to create lasting behavioral changes in young children. This study aims to further examine the use of TTYC by classroom teachers for students ages 4-6 years old with and without disabilities who had difficulty engaging in classroom routines or activities. A multiple-baseline across participants design was employed to demonstrate the outcomes of the TTYC in increasing appropriate classroom behavior and reducing problem behavior of the target children. The results indicated that the teachers’ fidelity of implementing the behavior intervention plans designed using the TTYC was relatively high with the exception of a few sessions. The teachers’ implementation of the plans resulted in increased appropriate classroom behavior and decreased problem behavior for all three child participants. The data indicated an association between implementation fidelity and changes in child behavior. When the teachers had difficulty implementing the steps for implementing intervention strategies, the children’s problem behavior increased, resulting in decreases in appropriate classroom behavior. Keywords: problem behavior, young children, teaching tools for young children, manualized behavioral intervention, classroom behavior