Presenting a conceptual model of urban decline in border city of Iran , using Grounded theory method

In current decline urban decay is new phenomena. Urban revitalization has emerged as a response to the urban decline problems. Generally, urban revitalization projects are applied on districts that are in a process of decay. Current cities are under risk of decay and chaos because of historic layers that are formed in leadership of the user’s needs such as contexts like commercial and social.The creation, growth and decay of cities are products of forces and natural and human flows and related relationships over time, and the Zabol is not separate from this general rule.The purpose of this study is qualitative and fundamental research which is done by the approach of data theory. In order to analyze documentary studies, it is a cross-sectional and in-depth analysis of the content and method of gathering documentary study and in-depth interviews. Nvivo software was used for data analysis and codingAfter studying documents and interviewing experts and analyzing data qualitatively with respect to the number of citations (350 citations), 17 initial codes were extracted as urban decline. 5 of which were political, economic, urban governance, environmental factors and social &culture are Core codes and the main components of urban decline. The basis of the presented components and the discovery of causal relations .The conceptual model (spiral model) of the decline of border cities was presented with emphasis on the city of Zabol.