Some behavioral tendencies are common due to characteristics of the Autism Spectrum Disorders. Whether these behaviors continue to be displayed, or whether or not they grow and greatly interfere with the individual's functioning, often depends upon behavior treatment plans, Behavioral difficulties commonly displayed by individuals diagnosed with Autism Spectrum Disorders, and effective means of treating these behavioral difficulties, are described and discussed. Authors include clinicians, researchers, parents and siblings of individuals diagnosed with Autism Spectrum Disorders.