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 Like in the other fields of social sciences, scholars who are working on urbanization processes and urban planning are often tempted by comparing. According to scientific production, they compare cities, urban practices of mobility, urban policies, consumption behaviors, or even urban projects. Then the question as to what is or is not comparable regularly comes up.DCUN network aims to discuss the question of comparative approach and proposes the following note entitled "Should We Compare the Processes of Urbanization in Paris, London, and Shanghai, or Paris, Marseille, and Vesoul? Strategies of Comparison in Urban Research" (By Joël Idt). Access to the DCUN Methodological Note (click here)&#160;