“…Likely because of its prevalence, acceptability, and effectiveness, time-out has been examined in the early years of applied behavior analysis (Burchard & Barrera, 1972; Wolf et al, 1964) as well as more recently (Donaldson & Vollmer, 2011, 2012; Donaldson et al, 2013; Slocum et al, 2019). More current literature on time-out has evaluated imperfect implementation of time-out, including schedule thinning (Donaldson & Vollmer, 2012) and delayed time-out (Slocum et al, 2019), because it may not always be feasible for interventionists to use time-out with a high degree of treatment integrity. Across most evaluations of time-out, its effectiveness is evaluated by comparing the level of behavior in time-in from baseline to time-out phases (e.g., Donaldson & Vollmer, 2011).…”