- AFRICA. FROM SHOULD TO COULD New model of planning practice required addressing the increase in migrations. How to integrate informal mechanisms into the urban management of the African culture. (The uncontrolled independence of Peter Pan’s shadow)   1179 kb by    Contin, Antonella & Della Rosa, Massimo & Ortiz Castaño, Pedro | antonella.contin@polimi.it    Short Outline Metropolitan management methodologies confronting new challenges: shaping rapid growth in a context of informality, scarcity and misgovernment. Metropolitan architecture methodologies facing the new urban paradigm of the non optimal city. The term post-optimal city is used to recall a post- functionalist dimension of the unfolding (new) size, scale and technology in the city. Abstract Theme: the research involves the transformation of the settlements, which are at the fringed edge of the metropolis (Dar es Salaam in this case), constantly changing, due to the fact that a huge number of migrants come there from the countryside, and characterized by a variable degree of informality. The area project falls within a new typology of formal- informal interface that we want develop as a gradient of formality. We present a study of a way to regulate the growth: an evolution in scale. We applied the Reticular Matrix Model System that is a development model rather than a formal model. It’s a study of a design method that allows us to describe and design urban phenomena related to the change of scale, which determines the mutation of types of morphologies of urban spaces and landscapes. Keywords Case Study presented on the ISOCARP Congress 2013: Frontiers of Planning - Evolving and declining models of city planning practice   Click to open the full paper as pdf document   Click to send an email to the author(s) of this paper