Review the effective processes and mechanism in development of informal settlements in Tabriz metropolis emphasizing on urban boundaries

Informal settlement with its different effects on the cities in general and metropolis specifically, indicates weaknesses in managerial programs and policies in different local, national and transnational level. This has been defined as a challenge in managerial system of metropolis, influencing its boundaries in different aspects. Informal settlement usually develops in the marginal parts of metropolis, beyond the urban development boundaries and in a self-driven manner. In this way it influences the standard boundaries of metropolis in different aspects. Tabriz metropolis has faced the problem in different periods of time, influenced and was influenced by it through its structural and performance system. In this paper we study the effective process in development of informal Tabriz metropolis settlements and determine the interaction of informal settlement in this city. This is an analytical-descriptive research in which data has been collected from the relative information from field and library studies. Research findings indicate the fact that Tabriz metropolis, for its conditions and for centralization of job opportunities is the first city in the region experiencing informal settlements. This has resulted in broad immigration from villages to the city, the main reasons of which can be economic poverty, unemployment in the origin in one hand and economic and employment opportunities in destination (representing centralization of sources and services in destination). The process has with time influenced by different structures, the spatial elements of Tabriz metropolis and its urban boundaries.