The above article belongs to the series of treatises aiminig at attributing such a form to categories and propositions of the historical materialism to make them become not only a mean of theoretical reflection on the m o d e r n societies but also a premise of field-empirical, sociological and economic research. The first part of the article is an attempt of the new interpretation of the proposition inherent in the historical materialism i.e. of "defining" a society as a whole (formation of a society) by its economic structure. Five basic processes, through which the "definition" of the social formation by its economy is carried into effect, are quoted there, as well as five theoretical and methodological functions performed by th...