PROJECT SUMMARY/ABSTRACT The goal of the current project is to adapt Central Executive Training (CET), an empirically-supported treatment for school-aged children with ADHD, for use with young children with ADHD. Consistent with NIMH Strategic Objective #3 and the NIH (1998) Consensus Statement on ADHD, this project will re-develop CET to translate clinical neurocognitive findings into a novel clinical protocol that affects ADHD behavioral symptoms by targeting central processes in young children. The final, computerized “CET Junior” protocol will reflect the contributions and feedback of a diverse group of caregivers, children with ADHD, and recognized experts in child development, human cognition, ADHD treatment research, RCT intervention design methods, serious game theory and task design, cognitive training, and the role of executive dysfunction in ADHD. Clinical trial data with older children suggest considerable promise for improving working memory and ADHD symptoms among youth with ADHD.