 Avempace knew the difficulties of bringing together the Porphyrian Eisagoge with the Aristotelian corpus as well as the need to classify and organize the sciences. He did not leave us a systematic treatise, but only wrote comments on Alfarabi’s writings. In spite of it, we can perceive a model that starts with the division of “meaning” into individual and universal, continues with the distinction between simple and composite universals, inserts the doctrine of the categories, moves toward the construction of syllogisms, and develops into the variety of sciences according to their syllogistic nature or not. Let us deal with the place of the categories.