In Proposition 75 of his commentary, Petrizi distinguishes five different modes of causa, characterizing them in nuce. He adds a fifth kind of causa to the traditional system of causes. In addition to the material, formal, final and efficient causes he conceives a creative cause (Petrizi, Opera II, prop. 75, p. 136). It was, he claims, neglected in the Aristotelians’ theoretical work, who, in contrast to Proclus, had underestimated the relevance of the creative cause. This applies both to Aristotle and to his interpreters, above all Alexander of Aphrodisias, whom Petrizi criticizes in this connection (Petrizi, Opera II, prop. 11, p. 38).