The educational publication is part of the UMC in computer science for grades 5-9, which includes the author's program, educational publications, workbooks, electronic applications and teaching aids. The principle of invariance to specific computer models and software versions is maintained. The theoretical material of the textbook is supported by the expanded apparatus for organizing the assimilation of the studied material, which ensures the preparation of schoolchildren for the state final certification in computer science in the form of the main state exam (OGE).