Our investigation on Hilary Putnam’s internal realist perspective (internalism) traces parallels and identifies differences between Putnam’s ideas and their antipodes: metaphysical realist (externalism) and radical relativist. Our research has focused upon the contemporary debate in which it is inserted, particularly, upon the challenge that radical relativism to impose on contemporary epistemology. Such challenge will not be surmounted through classical project to find absolute certainties. The history of science to point out that theories are not nets that to catch the reality as it is in itself. But this do not to imply that our view of knowledge are only determined for contingent aspects. In this scenery are hard enterprise but it is worthy-while to take into account efforts of philosophers as Putnam to propose a via media.
internal realism; metaphysical realism; relativism; racionality; objectivity