Equally important are the linkages which the models provide between theories at varying levels of abstraction, linkages which could be only briefly alluded to in this paper.38 The models allow one to trace the connection between specific human groupings and the place they occupy in more general sociological theory, whether that place is formal organizational theory, on the one hand, or urban and rural sociology on the other. Finally, with the qualitative differences indicated here, an opening wedge is provided for clarifying one of the knottier problems in community theory: the distinction between community and non-community. The implication is strong that the distinction is between systems designed to attain specific goals and those which have no such purposes, whose goals are at best diffuse.39