The title of this chapter has definitional connotations. It is generally assumed that definitions are irrelevant as far as the configuration of a field of knowledge is concerned, given that they are merely intentional or wishful statements and can hardly condense the real scope of what a field of knowledge actually is. It is often said that there are as many definitions as the authors who write in any given field. The fact is that definitions are of much more consequence than scientists generally presume (Sapsford, Still, Miell, Stevens, & Wetherell, 1998). Definitions are what make basic conceptions of a science apparent. They also function as an initial map of the territory encompassed by a field of knowledge. Definitions also legitimize the investigation of certain domains over others. The reader should recognize that to define means to fix limits or boundaries. More generally, at a time of thriving nationalisms, disciplinary nationalism also flourishes. Specifically, boundaries and territoriality are at the root of the struggles and conflicts by which the relative status and power of individuals and groups are shaped. Although these disciplinary struggles are discursive and symbolic, this does not prevent them from being very intense.The major thrust of my analysis is that social psychology, if it is to become a more representative and conceptually specific discipline, has to be not only social but sociological. The sociological dimension is what provides social psychology its specificity with regard to general or basic psychology. That is, in adopting the perspective of sociology, social psychology thereby becomes a part of sociology as well as psychology. This thesis is the connecting thread for the following arguments and observations. For this purpose 1 first make sorne historical references that have had a deep impact on the development of psychological social psychology; second, 1 evaluate briefly the so-called crisis of social psychology, a turning point with up-to-date consequences; and third, 1 describe sorne viewpoints of European and Latín American social psychology, the writings of which seem to go in the direction 1 am proposing. 1 end up with sorne considerations of Kelman's work and intellectual style, focusing on his conception of the discipline and sorne of his widely influential contributions in expanding the domain of social psychology.21