 Avicenna’s classification (or division) of the sciences is a natural complement to his treatment of per se as well as being one of the most innovative attempts to develop systematically the material on the subordination of scientific disciplines in Posterior Analytics A7, A9, and A13. It is also important for an historical reason. Avicenna’s account of the division of the sciences is in fact the only part of his Burhān that actually had a direct impact on the Western Latin tradition.