  The primary methodological reason, among social scientists, for adopting a commitment to methodological individualism was to caution against certain fallacies (ones that were quite common in 19th century social science). Perhaps the greatest of these fallacies was the one based on a widespread tendency to ignore the potential for collective action problems in groups, and thus to move far too easily “down” from an identification of a group interest to the ascription of an individual interest. One way of avoiding such fallacies was to force social scientists to look always at interactions from the participant’s perspective, to see what sort of preference structure governed his or her decisions.