... When positive behavior change can be achieved through simple manipulations of contextual environmental variables (e.g., staff positioning, seating arrangements, schedule changes), barriers to implementing other behavioral interventions can be decreased or avoided altogether. In their empirical review of literature on environmental manipulations as setting events, Davis and Fox (1999) outlined four types of contextual factors that could serve as setting events: (a) social events (e.g., interactions with peers, teachers); (b) programmatic events (e.g., sequencing of activities and work, choice of task, group vs. individual instruction); (c) biological events (e.g., sleep schedule [see Kennedy & Itkonen, 1993], food deprivation, medications, seizures); and, of particular value to the current study, (d) physical events (e.g., size of classroom, arrangement of furniture [see Bicard, Ervin, Bicard, & Baylot-Casey, 2012;Rosenfield, Lambert, & Black, 1985;Wannarka & Ruhl, 2008], temperature, lighting, materials available [see Doke & Risley, 1972]). ...