In today's urbanized world, the recreational space of cities provides the population with objects of natural nature. They ensure the environmental sustainability of the natural and urban environment and provide the population with a comfortable urban environment. The recreational space of the city is interconnected and interdependent with recreational activities in the existing recreational framework. Its quality directly depends on the quality of the existing recreational framework and the variety of recreational activities that occur in it. The purpose of the study is to determine the functional model of the assessment of the recreational frame of the city. The object of research is the recreational framework of the city. To achieve this goal, the methods of comparative analysis, generalization, structural and functional approach were used. The authors considered some theoretical ideas about the elements of urban recreational framework. They give the definition of the term "recreational frame" and identify the indicators of assessment of green areas of the recreational framework of the city, affecting the quality of life of the urban population. The authors substantiate the impact of indicators on the quality of life of the population and propose a functional model for the assessment of the recreational framework of the city.

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The article starts with the question, how can sustainable tourism be measured if it is a very complex, transversal, interdisciplinary and multidisciplinary term? In addition to the fact that tourism is not a science and lacks an object of study, the frequent problem of researchers is to pigeonhole and delimit the tourism phenomenon within quantitative parameters, mainly due to the lack of data and the lack of their own models for measuring tourism. Therefore, the objective of the research is to approximate an explanation of the understanding of the elements of sustainable tourism quantitatively through a linear regression.