Document Type : Research Paper

Author

Islamic Azad University of Mashhad

Abstract

There are three research levels in examination of urban structures. The first and third levels are overviewed at the beginning. The micro level of research studies the cities independently based on their unique location, historical origin and development, special combination of urban functions and applications and land use. Harris and Ulman, in their famous research in 1945 entitled “The Nature of Cities” clarified this point of view through the following statement: “Any city is unique in details but similar to other cities in function and pattern”.
In micro scale of research, all cities of the world are studied according to their common picture: a city is a considered as a type of residence on global scale that shows certain forms and functions which make it a city.

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