“…The PLS program included instruction following, functional communication, tolerance of delays, and friendship skills, based on the relevant literature on school readiness (e.g., Heaviside & Farris, ; Lin, Lawrence, & Gorrell, ; Piotrkowski, Botsko, & Matthews, ), as well as the functional assessment and treatment of problem behavior (e.g., Ala'i‐Rosales et al, ; Carr & Durand, ; Hanley, Iwata, & Thompson, ). In the original study, instruction occurred on a class‐wide level with 16 preschool children.…”