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TThis article tried to redefine the human scale to measure its hidden dimensions in the success of implemented urban projects along with other criteria of success. The purpose of this article was to better promote urban plans in the historical contexts of the country with the correct definition and focus on the dominant and common criteria of success. Therefore, restoration projects (improvement and renovation) implemented in the 1380s SH in the 12th district of Tehran have been considered for this work as a case study. The research method here was qualitative and quantitative, using coding concepts to redefine, Delphi technique to select designs, then ranking them through analytic hierarchy process. The qualitative interpretation of the concept of human scale in urban design literature, the degree of compliance in selected projects with other criteria and the degree of the overall success of each project is compared. That is, it can be mentioned as a common and complete limit in successful designs and spaces of the city. The share or percentage provided by this criterion, by the definition of this research, in each project, represents an acceptable ratio of the total success criteria of a project. Also, with the same relative conditions, among the internal concepts of the human scale, the role of popular participation, i.e. the non-physical dimension, is the highest in the success of space and body