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In the recent decades the spatial reflection of post Fordist economic transition in advanced societies has created new forms of urbanization which revealed the inefficiency of hierarchical paradigm. Thus by passing from the logic of territorial organization into logic of network organization, economics of scale to external economics of network, hierarchical links and one sided to the synergistic relationships and cross of many traditional concepts; not only in terms of analytical and descriptive but even more with a normative approach placed in a new form and nature which require re-definition and re-framing. The purpose of this paper is to explain the transition from planning concepts based on hierarchy to planning on the base of polycentric- network of regional structures. The methodology of the research is based on descriptive approach by reviewing the existing literatures regarding to these two main paradigms to analysis the relevant statements. The results showed that hierarchical theory does not offer specific strategy but network theories suggest a coherent framework of cooperation among the towns in different spatial scales which can lead to competitive position of cities and regions by increasing importance in international competitions  

Keywords: Key words: hierarchy, city network, central place, polycentric

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