The article is devoted to the problem of future masters' professionalism development in the process of practical training in the institutions of out-of-school education. Based on the analysis of psychological and pedagogical literature, the understanding of the concept of professionalism has been clarified, the peculiarities of practice in a multidisciplinary institution of out-of-school education have been revealed, the requirements to the bases of practical training of future masters of

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... ion, educational program 011 Educational, pedagogical sciences (Out-of-school education) It has been found out that the future teachers' practical training acts as an integrating main component of personal and professional development of the specialist, the link between theoretical training and independent work in the establishments and institutions of out-of-school education. Providing performance of various tasks, which include: acquaintance with the general directions of work in a multidisciplinary institution of out-of-school education; creation of an individual educational trajectory of the applicant of out-of-school education according to abilities of talents and gifts of children and youth on the basis of psychological and pedagogical diagnostics; development of curricula, calendar and lesson plans for group and club work, development of scenarios and script plans for collective and mass events, which are included in the annual work plan of the institution of out-of-school education. It has been specified that the professionalism of the future master will be reflected in the following results of practical training: the ability to recognize and take into account the diversity of students, the ability to provide individual support in the educational process; awareness of different contexts in which training, upbringing and development of students of out-of-school education can take place; ability to implement subject-subject interaction with different participants of the educational process at different levels; the ability to contribute to the formation of a general culture of personality, socialization, conscious choice and development of additional educational programs, using a variety of forms, techniques, methods and means of teaching; to master the norms of pedagogical relations in the process of designing and implementing educational activities, search, sharing, application of innovations and creativity in the educational process.