Introduction: Due to the uncontrollable process of urbanisation, within the next 30 years, up to nearly two-thirds of the world’s population will be living in urban areas. Most of this overwhelming urbanization is expected to occur in unplanned and underserved cities in the developing world. Along with the creation of a great upset for ecosystems, infrastructure, and the capacity of local governments, the most striking aspect of this tremendous rate of urbanisation in the developing world is the extent of informal settlements which provide shelter to as much as 32-85% of the population [9] and may cover up to one third to one half of the urbanized areas of the cities.Informal settlements are the phenomena that exist in many urban parts of the world and it involves problems such as bad living conditions, poor service standards and absence of secure tenure. Since the 1960s, informal settlement interventions have been a hot topic in developing countries, especially Iran and several models have been applied to solve the situation.