“…Early in its development, research in school-wide positive behavioral interventions and supports (SWPBIS) focused on case studies and quasi-experimental research documenting its promise for improving student outcomes (e.g., Chapman & Hofweber, 2000; Colvin, Kameenui, & Sugai, 1993; Nelson, 1996). Once this promise was established, researchers moved to more rigorous effectiveness research, including experimental single case studies and randomized controlled trials (Bradshaw, Koth, Bevans, Ialongo, & Leaf, 2008; Metzler, Biglan, Rusby, & Sprague, 2001).…”