This study, limited to Kitl al-sa'āda, examines two points: the first point concerns the place of political science in the hierarchy of the sciences and its dependence on Metaphysics. This dependence gives it a theoretical status and a proper subject, namely voluntary intelligibles which appear as objective entities and stable essences. The second point to be examined concerns these intelligibles, considered in their relationship to deliberation. From this viewpoint, they appear as formal invariants open to different formulations which correspond to (...) different modes of existence. These formulations are also formal rules to the realisation of intelligibles, and though they are more or less general, they are not universal. They are objects for deliberative discovery and the model of deliberative operations seems similar to the model of ingeniosity present in Algebra and the arts of ingenious devices. (shrink)