The social exclusion, especially in the middle-great cities, is growing up; the private affairs are acquiring power in the choices and in the projects connected to urban transformations, ignoring the collective needs. The binomial private-collective affairs risks to weaken the resiliency of the cities, in other words it risks to weaken the ability of the urban system to react to the changes in a positive way; since the urban system is complex, the preponderance of the profit-oriented logic weakens those components that should aim to reconstruct a new and effective balance. The urban plan (PU) depends, as it is known, on the normative choices and on the political-administrative decisions. According to this, the PU - that does not have empowerment – is not a tool that can engrave on the resiliency of the city by itself, by increasing the capacity of structuring fair and sympathetic urban systems. Since the PU is merely a tool of technical support to the political project, it is clear that the role that it can play for the realization of a city resilient is strictly dependent on the policy choices (about integration or expulsion, assimilation or exclusion, hybridization, solidarity, marginalization, and citizenship, etc.). The paper addresses whether and how the PU, in Italy, can provide effective responses to the needs of the most vulnerable citizens and, in particular, of the immigrants’ urban life. The PU defines, in fact, the articulation of the "adapted space", which must set the conditions through which each need can be expressed and satisfied, through which to the social demand corresponds a suitable offer, not only in quantitative terms but also in symbolic, aesthetic, semantic and identity terms. Therefore, the paper explores how public spaces can be structured and organized so that even "other" cultures can identify and acquire new shared identities and how different interests that often conflict between them (as, for example, between market and welfare) can be mediated. In the end, the paper tries to figure out whether and how the PU can make a contribution to the solution of conflicts between the above contrasting interests. The last research question deals with the tools that can support the act of planning or of developing (decision support – participatory processes) since they can let us understand if they can be effectively implemented, ensuring the contribution of the weaker members and the fulfillment of their needs.