This is an open-label study of the efficacy of Daytrana (methylphenidate transdermal system) for the treatment of attention and behavioral symptoms in children with Autism Spectrum Disorders. Twenty patients will be enrolled and treated with 10-30 mg of Daytrana for a total of eight weeks. Changes in core hyperactivity, impulsivity, and inattention symptoms, autism spectrum symptoms and functional outcomes will be assessed. Acceptability of the transdermal route of administration in this population will also be assessed.