 On several occasions—most notably but not exclusively in the context of the abridged treatments—Avicenna simplifies the analysis and avoids a detailed discussion of individual productive moods by providing general criteria for productivity, determined according to these different parameters. Again, this approach is structurally similar to the one adopted in the treatment of the categorical syllogistic but the complexity is higher due to additional variables at play with hypotheticals. It is worth noting that in Post-Avicennan logic, starting in particular with Ḫūnağī, considerable attention is paid to this part of Avicenna’s system, and the discovery of additional moods as well as the rejection of moods accepted by Avicenna were often associated with a critique and revision of these criteria (El-Rouayheb 2010).