Students with disabilities make up 10% of the school population in Croatia. The aim is to present and analyze 12 researches of school achievement and socialization of children with disabilities in regular primary education. Socialization and achievement that children with disabilities can make depends largely on the success of their integration into the regular educational system. Integration is seen as the inclusion of students with disabilities in regular classes, while inclusion means providing equal opportunities to all. The integration and inclusive education, creates the need to write many research and papers on inclusive education. The first three studies are about the attitudes of teachers. They point out the importance of additional education of teachers. Additional education is making process of socialization and achieving school success in children with difficulties much easier. Fourth research shows that socializing with people with disabilities leaves a positive impact on other students. Next three researches indicate poor socialization of students with disabilities. In the eight and ninth research emphasis was on evaluating and achieving school success of children with disabilities. Such children often don’t attribute their success to their own efforts. The remaining researches point to the importance of inclusive education. In these researches, there was a talk about attitude of parents, teachers and peers and it is demonstrate that their views are open for change. However, it is necessary to conduct research in which a single person can participate and talk about themselves, their feelings and expectations. Such studies provide an opportunity to really get to know them.