Upbringing and education have existed since the beginning of man. With the development of man throughout history, education has changed and supplemented. In that history of education, it appears the extraordinary educator Ivan Bosco. He left a great fortune for pedagogical science through his Preventive System. He put reason, faith and kindness into the foundations of the Preventive System. Reason is at the center of all upbringing, wich means that we believe in the child's or man's (if it is adult upbringing) abilities. We associate reason with faith and kindness. Faith gives us the meaning of human existence and therefore must be reasonable. Kindness, in addition to connecting us with everyday human love, it also encourages an atmosphere of happiness and joy. Bosco founded the Roman Catholic Church Order of Papal Law – the Salesians or the Society of St. Francis of Sales who operate in several cities and smaller towns of our Homeland Croatia. Their Salesian spirit attracts many children and young people to the experience of the Children's Summer, where Salesian educational methods stand out. Also, it is very possible to educate in the Salesian spirit in the family. The main goal of this paper is to get acquainted with the Preventive Educational System, wich can help future and current educators (and parents) in their attitude and view towards children of early and preschool age.