In order to properly diagnosis AS, a careful history should be obtained, including information related to pregnancy, early development, characteristics of development, as well as medical and family history. A review of previous records including previous evaluations should be performed and the information incorporated and results compared in order to obtain a sense of course of development (SOURCE). Additionally, several other specific areas should be directly examined because of their importance in the diagnosis of Asperger Disorder. These include a careful history of onset of the problems, development of motor skills, language patterns, and areas of special interest, such as favorite hobbies, unusual skills, and collections. Particular emphasis