“…However, this paper was developed by the members of a research network that used snowball-sampling procedures to identify leading programs (Siller et al, 2021). These programs include the Walden Early Childhood Center at Emory University (now the Early Emory Center for Child Development and Enrichment;McGee et al, 1999), Project DATA at the University of Washington (Boulware et al, 2006), Early Achievements at the Kennedy Krieger Institute (Engelstad et al, 2020;Feuerstein & Landa, 2020), Samsky Preschool at Marcus Autism Center/ Emory University (Siller et al, 2022), the Victorian Autism Specific Early Learning and Care Center affiliated with the Olga Tennison Autism Research Center at La Trobe University in Australia (Capes et al, 2019;Vivanti et al, 2019Vivanti et al, , 2022, the Children's Toddler School (now Alexa's PLAYC; Stahmer et al, 2011;Stahmer & Ingersoll, 2004), and the Susan Gray School at Vanderbilt University (Hine & Wolery, 2006).…”