The impact of class values on theoretization in the social & natural sciences is examined. While the natural sciences depend for verification on experimental demonstration, social science analysis is based on abstraction. Consequently, class bias is much more likely in the social sciences because the inevitability of value judgment imparts a class perspective to all theorizing. However, unlike religion, bourgeois social science does not generate totally fantastic representation of reality; theories such as Keynesianism have a certain measure of practical validity. Proletarian social science (historical materialism) is not free of class bias either, but if its perspective is guided by the historical interests of the working class & it conforms to acceptable methodological criteria, it can generate objective knowledge of reality. S. Karganovic.