The present research is done to identify physical and social criteria which have influences on the formation and remembrance of collective memory of the city, with the emphasis on city of Tehran. Literature review indicates that the evaluation criteria are divided into two major groups: "possibility of events and social interactions to take place", and "possibility of remembering and recording of collective memory". Each group is then subdivided into two minor parts: "social and political structure" and "spatial and physical structure". Performance criteria influencing on "possibility of events and social interactions to take place", related to "social and political structure" of the city are: social and environmental security, ethnic variety, social classes, historic events, public ceremonies; and performance criteria influencing on "spatial and physical structure" are: access to public places and resorts in both city and neighborhood scales. Similarly, performance criteria influencing on "possibility of remembering and recording of collective memory", related to "social and political structure" of the city are: place bond and attachment, residence continuity, and position of city in literature and cinema; and performance criteria influencing on "spatial and physical structure" are: conservation of historic areas, old buildings and neighborhoods, urban reminders, and local names. Tehran is known by the urban planners, architects and even ordinary people as a city of change without any memory or reminder of the past. This could be considered as an un-proved statement, which its truth is being examined according to the recommended criteria and research method of the paper. Doing so, a case study on Tehran is done by collecting variable documents on other researches to evaluate each criterion accordingly. The evaluation is done through asking a question at the beginning of each related section, and finding the answer at the end. The relationships between mentioned criteria are introduced in a table, and the intensity of their interrelationship is marked by the author, according to the analytical results of the text. The primarily results of this text analyze, indicated that social security and access to variable public spaces in city scale are important factors in formation of collective memory. Similarly, conservation of historic areas, old buildings and neighborhoods, urban reminders, and local names, are important in remembering and recording of collective memory. The research results have been applied to introduce planning recommendation through SWOT method. It indicated that considering the political and social significance of Tehran (as the capital city and a scene for historic and social events to take place, and the place for coming together of people from different parts of the country), and its physical and spatial characteristics (public spaces and local gathering areas), it has great potentials in collective memory formation. However, due to social and environmental insecurity, rapid changes in the city and neighborhoods built form, and constant population movement; collective memory could not be recorded or remembered easily. In another word, Tehran is the city of short term memories, as the traces of old events are rapidly being removed.