“…Intervention methods that were used by more than one study included in the current review were variations of multiple-exemplar instruction (n ¼ 4; e.g., Byrne et al, 2014;McHugh et al, 2011); intensive tact instruction (n ¼ 4; e.g., Greenberg et al, 2014;Pistoljevic & Greer, 2006); and matrix training (n ¼ 3, e.g., Frampton et al, 2019). Some other interventions that were used by single studies included comparing different prompting methods (e.g., standard versus intraverbal prompts; Sundberg et al, 2000); comparing different stimulus presentations (e.g., isolated versus compound stimuli; Hanney et al, 2019); using mixed verbal operant instruction (e.g., tact versus tact with echoic; Kodak and Clements, 2009); video modeling (e.g., Akmanoglu, 2015); total communication training (Carbone et al, 2006); PECS (e.g., Conallen & Reed, 2017); observational learning based on PEAK training methods (e.g., Dixon et al, 2017); behavioral momentum (Kelly & Holloway, 2015); and sign exposure (Valentino & Shillingsburg, 2011).…”