Behavioral disorders as a phenomenon have lately been causing challenges on educational system. Inclusive society implies students with behavioral disorde, or the ones that are at risk of developing disorder have the same education possiblities for further success as their peers. For that reason, emphasis is placed on prevention of developing behavioral disorders throught the whole school. Out of all prevention programs, which there are many, those that encourage positive forms of behavior and thinking have turned out to be the most effective. This paper shows PBIS prevention program (Positive Behavioral Interventions and Supports), which also provides special treatment for those who need it. The program is carried out through three tiers, in which it includes the whole school staff, family and local community. Research have shown that it benefits school atmosphere, academic success, positive behavior, mental health and the level of confidence. The most important factor for successful implementation of prevention program is good education and building teacher's competence. Also, parents' and community's understanding and cooperation have shown to be prohibitive factor in developing behavior disorders. Teachers point out that the biggest challenges to implementation are their lack of time and motivation, and insufficient knowledge. Schools are required to understand the importance of prevention and come with an action plan.