 Avempace’s annotations to Alfarabi’s Kitab al-Madkhal are more innovative than they might seem at first sight. He points out that the Eisagoge should not be limited to the exposition of the five “sounds”—maybe six, if the individual is  added[13]—and  that a particular science was needed to lay the foundations for the Organon. He conceives this science as a formal theory of individuals and classes that is followed by the theory of definition and description.