Data from the Psychoeducational Profile—Revised (PEP—R) were analysed in a sample of 46 children, aged from 1.7 to 5.11 years, of whom 21 had autistic disorder (AD) and 25 had pervasive developmental disorder not otherwise specified (PDD-NOS). Analysis with a t-test for independent samples revealed a significant difference (p < 0.05) between children with AD and those with PDD-NOS on both developmental and behavioural PEP—R scales, supporting the utility of the PEP—R in discriminating between two diagnostic groups. This study emphasizes the effectiveness of the PEP—R as a tool for the early assessment of children with pervasive developmental disorders.
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