The international system for the classification of protected natural areas developed by the International Union for Conservation of Nature (IUCN) is intended to provide a common language for the management of these areas. The main objective of this study is to examine the institutional compatibility between different countries and the guidelines proposed by the IUCN. The method used consisted of a comparative analysis of the institutional and legal frameworks in South Africa, Australia, Brazil, China, the United States and Italy. The findings indicate that few countries have adopted the IUCN proposals in their entirety. Some have adapted their laws to the international guidelines, although with various changes, such as differences in the nomenclature used for management categories, while in other countries the legislation diverges substantially from these guidelines. In conclusion, these divergences and incompatibilities make it difficult to exchange experiences at an international level and adopt common strategies for the conservation of natural heritage.

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For many reasons, open spaces remain "forgotten" in the functional dynamics of cities. In this scenario, the main objective of this study is to analyze experiences of the use and appropriation of these places, considering the theoretical references pertinent to facing the problem of their gradual "forgetfulness". In order to do so, the work starts with the interpretation of empirical examples: five Brazilian state capitals in different geographic regions, urban insertions, economic conditions and non-original local functions. The results obtained lead to an understanding of the problems posed in differentiated positions in the urbanized network and to the perception of alternatives to mitigate the social vulnerability of at-risk groups, especially children and adolescents exposed to psychoactive substances. Shared spatial appropriation, with spatialities, temporalities and functionalities related to the sense of collectivity and the discernment of citizenship, offers possibilities so that these individuals do not also remain "left out" and "omitted" in that debate.