Complexity and public policies: Cobweb type.

The following article rises that the methods to realize public policies elaborated from the paradigm of the ";classic science"; do not solve in a satisfactory way the problems of the society. This owes to that a socially troubled issue is a complex system and the methods to resolve public policies that depart from the paradigm mentioned before are not developed to approach complexity problems of this type. That is why it is necessary to develop a method of public policies that departs from the field of the complexity. The aim of this work is to develop a method to design and develop public policies, based in the knowledge of complex system, so that it can fulfill in a satisfactory way the necessities and demands of society.