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The growing and enduring popularity of our Assessment series is in part due to the long-term developmental procedures initiated by our parent-professional collaboration. Each of our assessment instruments was formulated and revised by our regional TEACCH® Centers and was not released for publication until it was found to be beneficial during our assessments of individuals with ASD. The PRO-ED Assessment series has undergone important revisions, and the PEP-3 includes a comparison group of children with autism rather than only a comparison with typical children. The development of the TEACCH Transition Assessment Profile (TTAP) assists with transition planning from school age to adolescence and adulthood.