“…They concluded that PECS may be more effective for children at the pre-request stage and RPMT may be more effective for children with some ability to initiate joint attention. Other studies have investigated parent and environmental predictors of intervention response (Ben Itzchak & Zachor, 2011;Gabriels, Hill, Pierce, Rogers, & Wehner, 2001;Osborne, McHugh, Saunders, & Reed, 2008;Robbins, Dunlap, & Plienis, 1991). This direction is encouraging as it better takes into account the heterogeneity of ASD and allows for intervention to be tailored to needs and abilities, rather than based on a categorical diagnosis.…”