The preventive system is a successful pedagogical method developed by St. John Bosco for educating young people. It is based on three key pillars - reason, religion, and loving kindness. The aim of the preventive system is to provide students with a wholesome learning experience that imparts integral values and prepares them to become good human beings and responsible citizens. It is a practical approach focused on experience as a medium of teaching. The preventive system characterizes the Salesian schools around the world.