There are many theoretical perspectives on the welfare state. These include the Marxist (Offe 1974), social-democratic (Esping-Andersen 1990), citizenship (Marshall 1950), and pluralist approach (Gilbert 1983; Johnson 1987) to name only a few. Two main approaches have been used to organize these theories of the welfare state and locate them within broad analytic frameworks. One method, the typological approach, develops classification systems which conceptualize welfare state theories according to their purpose. This view does not impose any sort of linear or temporal structure on the theories, but groups together those which advance our understanding of the welfare state in similar ways. The second main approach to organizing welfare state theory is a historical-classification based on dominant theoretical orientations. This paper develops a third method for the analytic classification of welfare state theory, which involves a historical-evolutionary approach. This approach rejects the historical-dominant premise that different stages are dominated by alternative theories, and poses instead an evolutionary model under which two main lines of theoretical orientation compete, are reformulated, and empirically refined overtime.