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The textbook contains notes on all lessons of the 9th grade computer science course, developed with the basic approaches of person-centred learning technology. The content of the lesson notes includes practical work and competence tasks of different levels of difficulty. Each lesson plan has a methodologically competently formulated purpose, type, lesson objectives, necessary equipment and expected results. It is assumed that the lesson plans can be supplemented by the teacher, if necessary, and a special place for notes is provided. The proposed forms of work, types and content of tasks will greatly facilitate the teacher's preparation for lessons and free up time for their own creativity. The notes are compiled in accordance with the Curriculum for the course "Computer Science. Grades 5-9 for secondary schools", which is designed for students who have not studied computer science before grade 5. For teachers of computer science.