This article has as main objective to build a preliminary theoretical model to make possible to understand the reasons that determine the institutional acting, particularly in Rio Grande do Sul. In other words, to understand the mechanisms that allow to the local governments to accomplish their purposes, how to build highways, to educate the children and to promote the development in a satisfactory way. For so much, starting from the revision of the specialized bibliography, we built an understanding to make possible to understand the acting of the State in their formal institutional implications in itself (neoinstitutionalism), North (2001), as well as, their implications with the patterns values (social capital) that give support the these ("the endogenous circuits of mutual determination"), like this the concept of social capital (CS), it is constituted in the central reference of this article, because, it can allied allied to the political institutions, to favor the governments' acting.