Applying external scientific knowledge - i.e. knowledge achieved in the field of disciplines and sub-disciplines related to political science - in fulfiling such methodological functions as explanation and prevision (forecasting) is frequently approached in meta-scientific and meta-theoretical considerations as conducted on the ground of the family of scientific disciplines constituted by the sciences of politics. These functions can be ascribed to the purely epistemological aspect of scientific activity, not its institutional and organizational aspects. The dispute regarding the explanatory autonomy of political science is fallacious. From the logical and methodological point of view, the institutional “affiliation” of object knowledge, which constitutes a premise in complex inferences, does not play a role in the fulfilment of the assumed cognitive tasks; what is important instead is its epistemological credibility, as well as the goals of the research strategy selected by a given scholar.