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