This study aimed to compile a screening scale for high-functioning pervasive developmental disorders (PDD), using the Tokyo Child Development Schedule (TCDS) and Tokyo Autistic Behavior Scale (TABS). The 72 participants (IQ greater than or equal to 70) were divided into 3 groups after IQ matching depending on their diagnoses: i.e., PDD, attention-deficit hyperactivity disorder (AD/HD), or other than PDD or AD/HD. Among the items of TCDS and TABS, correlation with PDD diagnosis was confirmed in 3 items. A screening scale consisting of these 3 items (TCDS/TABS-3) had a sensitivity of 0.75 and a specificity of 0.84 at 2 cutoff points. We consider that the TCDS/TABS-3 encompasses and adequately reflects the autism diagnostic criteria and would be a useful auxiliary scale for PDD diagnosis. (Contains 8 tables and 1 figure.)