The problem arises from Suárez's influence on Leibniz's conception of individuality. For this purpose, Leibniz's Disputatio Metaphysica de principio individui is mainly analyzed. There are three different positions: Thomist, Scotist, and Suarez. Leibniz's idea of "form" is confronted with that of Aristotle and the idea of "substantial form" with scholasticism and Suárez. Leibniz's comparison with Suárez focuses on the key notion of “substantial form” and its various meanings are analyzed. The agreement of both authors has formulated around the thesis that individuation takes place by virtue of the “total entity”. Finally, the exact meaning of this expression is analyzed and the differences between the two authors are pointed out, especially...