“…First, behavioral descriptions for the checklist were selected from several sources, including Rimland's E-2 Form (1964), Creak's nine points (1964), the Behavior Rating Instrument for Autistic Children (Ruttenberg, Dratmann, Fraknoi, & Wenar, 1966), Rendle-Short and Clancy's Checklist (1968), Lotter's Checklist (1974), characteristics defined by Lovaas and colleagues (Lovaas, Freitag, Gold, & Kassorla, 1965;Lovaas, Koegel, Simmons, & Long, 1973), and Kanner's descriptions of the syndrome (1943,1958). In the second phase, 26 internationally recognized experts in the field of autism were asked provide feedback on the behavioral descriptions.…”