It differentiates what them is the reach of the respective services, therefore the reach of the service given for a center can be bigger or lesser of what the reach of another one, depending on its respective areas of influence (' ' field of foras' '). This territorial system? set of dependent urban centers of the territorial portions involves that them, called areas of influence? it is not characterized only for the functions exerted for its elements (centers). The activities and services of each one are multiple, and the efficiency of the system as a whole does not depend on the best or worse physical endowment of each center, face to the functions that fits to it to play, but yes of its localization, therefore the territorial system must be seen of integrated form, and not separately. Thus, the development questions if arrest to the questions of localization, that, in turn, depends on the distribution of the urban centers for the domestic territory, as its dimensions, measured for the services that gives to immediate its entorno and for the reach of its area of influence. 4. The territorial organization as cause of the unbalanced process of the development the forms of occupation and distribution of the population and the productive activities in the territory occur as a succession of ' ' focos' ' dynamic through the time, with one ' ' foco' ' dominating excessively in determined period, but trying the sprouting of others ' ' focos' ' as complementary to that it is dominant, one of which will assume the hegemony on excessively, imposing its ' ' field of foras' ' on another parcel of the territory. That is, the development process, from a territorial perspective is unbalanced and desequilibrante. The importance of ' ' foco' ' it elapses of the existence of activities with capacity to dominate and to exert, in way irreversible, influence on its surrounding space.