 The purpose of this study is to determine whether a new treatment, Unstuck and On Target UOT, works better, worse, or the same as the best treatment that is available now, Contingency Behavioral Management CBM, for low income children with Autism Spectrum Disorder ASD or Attention Deficit Hyperactivity Disorder ADHD. Researchers predict that UOT will be better than CBM for children with ASD and ADHD at improving cognitive problem solving, executive functioning, self-control and use of medical care, but equal to CBM at improving behavior and coping. 