The thesis deals with school maturity, stage of psychological evolution in the preschool and the early school age. The solution will view parents of future pupils from three primary schools Kladno on school readiness and the onset of schooling and in this sense, the results of the survey are compared. The theoretical part will solve the view of a child under school age from various angles, his cognitive development, socialization and the other. Furthermore, I will deal with school maturity and readiness, cognitive, somatic and emotional level of development of the child at the onset of schooling. Three elementary schools, where research was conducted, will be presented in detail .The practical part analyzes the survey, carried out on the da...