Children with autism spectrum disorders (ASD) are impaired in their ability to produce and perceive dynamic facial expressions. Automated facial expression recognition technology opens new possibilities for clinical research, assessment, and intervention systems. This project will develop a computer assisted intervention system to enhance the social communication skills of children with ASD. The computer vision tool enables novel interventions that focus on facial expression production. Intervention games will be developed to provide automated feedback on facial expressions produced by children with ASD in an engaging and cost-effective manner. In addition to improving production skills, practice with facial expression production may also improve perception skills by linking motor production with perception. This project will also characterize facial expression production of children with ASD in a battery of assessment tasks, including automated facial expression measurement with the Computer Expression Recognition Toolbox (CERT). The intervention system proposed here could have tremendous impact on social development in any patient population with atypical facial expression production, including ASD and attention deficit disorder. The project will also contribute to the understanding of the development and learning of motor skills essential to social functioning.