“…RIT was initially implemented as a direct, provider-to-child intervention (Ingersoll, 2010(Ingersoll, , 2012Ingersoll et al, 2007;Ingersoll & Schreibman, 2006), with four independent replications using single-case design (Cardon & Wilcox, 2011;Penney & Schwartz, 2019;Töret & Özmen, 2019;Zaghlawan & Ostrosky, 2016). RIT has been evaluated in various formats and settings, including telehealth training (Wainer & Ingersoll, 2013b), enhanced provider coaching (Penney & Schwartz, 2019), parent implementation (Zaghlawan & Ostrosky, 2016), parent-to-parent peer training (Hall et al, 2019), and implementation in the Washington State Part C early intervention (EI) system (Ibañez et al, 2021). However, the core components of RIT have not been documented, and the rationale for RIT's effectiveness has not been evaluated.…”