  Du Châtelet’s belief that hypotheses gain strength the more phenomena they explain indicates a commitment to the idea of simplicity and systematicity of causes, and the orderly interconnectedness of cause and effects in the created world. These features, to recall the discussion above of her PSR, are explicitly associated with the PSR, and that principle’s metaphysical  dimension.[24] For not only is the PSR a principle which guides our own search for knowledge, it is a principle which guided God in his choices when creating the world (IP §23) which, as the best possible world, is “the one where the greatest variety exists with the greatest order, and where the largest number of effects is produced by the simplest laws” (IP §28). So the ability of hypotheses to explain a plethora of phenomena is a direct result for Du Châtelet of the real systematicity of the world’s causal structure  itself.[25] This point drives home the suggestion made above that Du Châtelet is squarely in the Aristotelian tradition with respect to hypotheses; hypotheses are meant to capture the true causal structure of our systematically interconnected world, and are not only calculating or predictive devices by which the scientist merely gives an accurate description of the phenomena. At the same time, and we shall see this in the next section, the fairly significant degree of separation between metaphysics and  physics mentioned at the close of the previous section will put  strict limits on how much the scientist can appeal to systematic interconnectedness in   physics.[26]