A comparative social science requires a generalized system of concepts which will enable the scientific observer to compare and contrast large bodies of concretely different social phenomena in consistent terms.
David Aberle, Albert K. Cohen, A. K. Davis, Marion J. Levy Jr. and Francis X. Sutton, (1950). T"he functional prerequisites of a society." Ethics, 60(2), p. 100; cited in: Neil J. Smelser (2013), Comparative Methods in the Social Sciences. p. 189
Marion J. Levy Jr. [was] a scholar of sociology and international affairs who wrote about modernization theory, which seeks to explain why some societies undergo rapid economic development and corresponding social change.
Eric Pace. "Marion Levy Jr., 83, Authority On the Modernization of Societies," New York Times, June 17, 2002