Analysis of the level of sustainability in the theory of development and planning of neighborhoods (Case study: Neighborhoods of zone 3 of Gorgan city)

Introduction
The cities are considered as the centers of social, economic and space development, and the most appropriate places for the occurrence of problems. therefore, the main manifestations of development are negative and positive, mainly in cities and one of the tasks of modern societies is the creation of cities and sustainable localities in economic, environment, and special space - physical. The innovation of the present study is the use of all development indicators simultaneously to identify and verify the current situation, which has not been done in any study for the city of Gorgan. the aim of this study is to measure and analyze the level of physical, economic, biological, social and security of urban localities. the present study is applicable in terms of purpose, and its method is descriptive analytical. The statistical population of the study includes all people living in zone 3 of Gorgan city. In the present study, Cochran's formula was used to calculate the sample size and the sample size was estimated to be 384 people. to determine the sample size, the appropriate attribution method was used. the research results show that the new Gorgan neighborhood is located in the best stable condition, after which the neighborhood of Khayyam is located and the neighborhoods of Jangal School, Mikcheh Garan neighborhood, Sarpir and Dabaghan neighborhoods, Kianshahr alley, Javadieh alley, Hafez alley, Buyeh neighborhood are in the next ranks in terms of local sustainability. In addition, there is a lot of inequality in the level of stability of a neighborhood in Gorgan. The results of this research can be used for Gorgan Municipality and the City Council and the Road and Urban Development Administration to intervene to recreate and provide more appropriate services to citizens.
Gorgan, like many large cities in the country, faces many problems, including development instability, and this issue reaches its highest level in some neighborhoods. Although neighborhoods are the core of urban life, they have no place in the formal spatial planning system. This has led to an intensification of development instability in them. In the face of the problematic growth of cities, different planning approaches are looking for realistic solutions for urban development, one of the most important approaches is the approach of sustainable development in neighborhoods and urban contexts. While to achieve the stability of society, more attention should be paid to the lower levels. This inconsistent understanding of urban sustainability leads to the lack of an integrated solution and coordinated measures to address such a complex issue, thus necessitating a comprehensive understanding of urban sustainability.
Methodology
This research is considered as a descriptive-analytical method and in terms of how to collect the required information and data, it is considered as a field and survey research. The present study was applied in terms of purpose. This research has been done in two parts: documentary and field studies. The technique of studying documents, which is based on taking notes from books and written works, has been used to be aware of the opinions of experts in the field of concepts and theoretical issues related to the field of research. The statistical population of the study includes the residents of the neighborhoods of District 3 of Gorgan (114348) which has an area of ​​1,523 hectares. Among them, 384 individuals were selected by convenience sampling
 
Results and Discussion
The stability of neighborhoods in the region of three cities of Gorgan is unbalanced. Out of nine neighborhoods, three neighborhoods (Sarpir and Dabaghan neighborhoods, Khayyam alley and Jangal school) studied with the development sustainability index with 95% probability had a significant level higher than (0.05) and their performance in creating sustainability was not accepted. In general, according to the average results, it can be said that the region of three cities of Gorgan is low in terms of the level of neighborhood stability, and therefore the attention of managers and city officials, especially Gorgan Municipality in this regard is necessary to take measures to Increase the sustainability of the neighborhood. In fact, the more development develops in an area, the more sustainable the level of human settlements or neighborhoods.
Conclusion
According to the results, the averages of physical, environmental, economic, social and security dimensions are less than average (3), so the components and sustainability dimensions of Gorgan neighborhoods are in a lower than average condition. The results showed that there is a significant difference in stability between residential areas of Gorgan in residential contexts. So that the average stability of the new Gorgan neighborhood is in the best condition compared to other neighborhoods. Khayyam alley neighborhood. The neighborhoods of Jangal School, Mikcheh Garan, Sar Pir and Dabaghan neighborhoods, Kianshahr alley, Javadieh alley, Buyeh neighborhood are in the next ranks in terms of sustainability.