“…Dufrene, Lestremau, and Zoder-Martell (2014) utilized a multiple baseline that only included two tiers. Seven single-case design studies met standards without reservations (Coogle et al, 2017; Coogle, Rahn, & Ottley, 2015; Coogle, Rahn, Ottley, & Storie, 2016; McKinney & Vasquez, 2014; Ottley et al, 2017; Ottley & Hanline, 2014; Scheeler et al, 2016). All of these studies were published in 2014 or later, which is after the publication of the WWC quality standards.…”