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У статті проаналізовано теоретичні аспекти поняття обліку дітей дошкільного, шкільного віку та учнів, його природу та сутність, розглянуто нормативно-правову базу з питань організації і ведення обліку дітей дошкільного, шкільного віку та учнів в Україні. У результаті дослідження визначено перспективи формування понятійного апарату, закріплення на законодавчому рівні понять «реєстр дітей», «облік дітей», а також основні напрямки удосконалення існуючого механізму обліку дітей. Зокрема, у результаті аналізу процесу обліку дітей дошкільного віку згідно з діючим законодавством було обґрунтовано потребу запровадження й ведення реєстру для здійснення обліку дітей 5-річного віку, також законодавчого закріплення обов'язку розроблення і затвердження порядку/механізму організації і обліку дітей відповідного віку на визначеній території, визначення форми ведення реєстру.During the study, the legal acts on the organization and implementation of registration of preschool, school age and students were analyzed. The current mechanism of registration of children of preschool, school age and students, which is conducted to ensure their pre-school and general secondary education, is provided by the Procedure for registration of children of preschool, school age and students, approved by the Cabinet of Ministers of Ukraine on September 13, 2017 № 684. Whereas this mechanism provides for coordinated interaction between authorized bodies and local executive bodies, local self-government bodies, children's services, special institutions, institutions providing social protection and crime prevention, educational institutions to ensure that children receive preschool and general secondary education, the issue of the effectiveness of its implementation in Ukraine was also considered. In addition, the theoretical aspects of the concept of accounting for preschool, school age and students are considered. As a result of the research, the prospects for the formation of the conceptual apparatus, consolidation at the legislative level of the concepts of "children's register", "children's accounting" are determined. The main directions of improvement of the existing mechanism of registration of children are formed, in particular, in order to avoid formal submission of statistical reporting it is offered to settle the issue of keeping records of children of senior preschool age in the form of the register according to the certain form. development and approval by local executive bodies or local selfgovernment bodies of the procedure (mechanism) for the organization and registration of children of the appropriate age in a certain territory, taking into account the peculiarities of the administrative-territorial unit. Equally important will be the definition of the form of maintenance of the register for the proper organization and control of its relevance, as well as recording information about its update, always taking into account the technical capabilities for rapid and high-quality processing of information.

The theoretical and practical approaches to solving the problem of forming the methodical readiness of the future teacher for work in the conditions of the information and educational environment of the educational institution are considered. The development areas of the teacher's methodological preparation for the planning and implementation of the educational process in the information and educational environment are substantiated.

The chapter describes investigations of steganographic methods of information protection, which use containers represented by files in AVI format. MP3 audio files are selected as data that is embedded in the used container. For the introduction of audio data, the video container was divided into control and information parts. Secret data were embedded in the information part of the video file, which did not lead to distortions when the container file is played. Studies have been conducted to find repetitive blocks in the structure of a video container. The chapter analyzed the determination of the amount of embedded data for containers with different parameters: color saturation, video file resolution, video file length, compression quality, and frames per second. An algorithm has been developed for the introduction and extraction of information represented by sound formats.