In recent years, many education systems have undertaken an important shift towards results-based management (Bourgault, 2004). This type of management leads us to take a look at the success of students with behavioural difficulties because they are the most likely to drop out of school (ministère de l’Éducation, du Loisir et du Sport, 2006). It is therefore essential to implement an evidence-based intervention system that promotes the prevention of these difficulties. The Positive Behavioural Interventions and Supports (PBIS) system is evidence-based (Lapointe & Freiberg, 2006). PBIS, named Soutien au comportement positif (SCP) in French, is a behavioural response-to-intervention program. In this paper, we describe the SCP. Subsequently, we show its effects on the reduction of student misconduct within Québec schools, thus contributing to the prevention of behaviour problems.