green roof development criteria by using Best- Evaluation and prioritization of Worst method

Megacities recently are experiencing a shortage of green spaces basically due to an increase in both urbanization demand and residential complexes. In order to solve this problem and create sustainable urban development, green roofs have been suggested as one of the useful options. Therefore, it is necessary to pay special attention to its use so that we can witness the creation of urban facilities and welfare along with the preservation of citizens' health. The purpose of this research is to evaluate and prioritize effective criteria in the development of green roof. For doing so, by using library studies and experts' opinions, the criteria were extracted and classified into three environmental, economic and social groups, consisting of thirteen sub-criteria. After checking and confirming validity and reliability and collecting questionnaires distributed among experts, data analysis has been done using the best-worst method. The results shows that economic indicator attract the highest priority among others. Additionally, the most important sub-criteria in environmental, economic, and social groups was air quality, roof longevity, and public health, respectively. Finally, the respective highest and lowest scores were assigned to roof longevity and biodiversity when all criteria were considered. However these results may change in other countries .