Writers on Pareto's diverse contributions to economic or sociological thought have often been concerned with his methodology.! It is, indeed, difficult if not impossible to understand his mind without some knowledge of his methodological approach. Besides, an interest in his methodology is of special importance because even though, as in the case of most of his writings, it lacks both consistency and clarity at times, his methodological approach to economics is widely adopted by most of the leading economists of our day.2 In this chapter I shall limit myself to the more important aspects of this approach and raise some questions largely ignored or not emphasized sufficiently in the Anglo-American literature on the subject. I shall also discuss summarily his approach to sociology. Finally I shall compare his approach with that of Walras.