The modern way of life has led to the fact that today's children spend much more time in preschool. Likewise, the modern understanding of upbringing has spawned new insights; that the young child develops and learns primarily in interaction with his environment. Children's environment, in our case the preschool institution should provide children with a stimulating environment in which each child will be able to develop individually in accordance with their interests, knowledge and abilities. From the interaction of the child with his environment, and especially with other children, socialization relations will develop. The aim of this research was to examine and compare some of the socialization strategies used by children in regular and Montessori programs, and to try to gain insight into their differences through the activities carried out. Also, try to gain insight into the existence of differences between the social sensitivity of regular children and the Montessori program based on systematic observation. All children showed a certain level of social competencies that manifested through different areas. In the regular program, children showed a higher level of communication skills while in the Montessori program the emphasis was on developing empathy, tolerance and mutual help. The results showed that there are significant differences in social sensitivity in children of the regular and Montessori programs.