Child and adolescent psychiatrists may be the first to assess a child or adolescent with an autism spectrum disorder. They need the knowledge and skills that improve their ability to make diagnostic categorizations, to develop accurate prognoses, to predict recurrence risks, to obtain appropriate laboratory analyses, and to appropriately make referrals to sub-specialists. The difference between essential and complex autism is explained; and participants better understand the prognostic implications of each category of autism. The Workshop defines and demonstrates examples of dysmorphic features and introduces the autism dysmorphology measure (ADM), which participants have the opportunity to practice under the supervision of the geneticist who developed it.