This article examines the two fundamental streams on which it has been argued politically. From a review of the assumptions that the underlying communitarianism as universalism is to demonstrate the limits of each one and use that one to the other in a dispute which is not absolve. Who is identified in this written ethics epistemologization is of fundamental importance as a methodological resource for the analysis as introduces the incommensurability as a frame of reference for the attack and defence of the two streams. The article arrives to sketch a structure analysis of the two positions that we have to understand them critically.