A more specific level of matching a particular learner to a classroom with characteristics most suited to his or her needs starts with careful consideration of the learner. The term ASD includes an array of people with markedly different educational needs (Harris 2007). These dimensions of difference include intellectual ability; severity of autistic symptoms including communication, resistance to change, and social skills; chronological and developmental age; the presence of challenging behaviors such as tantrums, aggression or intrusive stereotypic behaviors; and the specific skill sets of each child. There is research to support general placement considerations based on these factors.