Methods	Clustered randomised controlled trial
Participants	12,334 students nested in 37 elementary schools 52% Male, 46.1% White (largest ethnic group)
Location	Maryland, United States
Interventions	School‐Wide Positive Behavioural Interventions and Supports (SWPBIS): a programme that targets a systemic change process in a whole school or in a district. SWPBIS aims to reduce students’ behaviour problems by changing staff behaviours and developing systems and supports to meet children's behavioural needs.
Programme deliverers	School staff, teachers and administrators
Evaluator role	Independent
Outcomes	Aggressive and disruptive behaviour Concentration problems Pro‐social behaviour Emotion regulation Office disciplinary referrals Out‐of‐school suspension
Length	Four years of implementation
Assessment	Five times over the course of four years.
Attrition	“Participation rate was consistently high, […] no evidence that missing data was problematic” p. e1140
COI statement	Declared
CoFI	Unlikely, independent evaluator (p. e1136)