 The notion of grounding has been increasingly a topic of discussion in contemporary metaphysics. Grounding is said to be a kind of explanation distinct from causal explanation. It is a metaphysical or constitutive explanation. It is generally taken to be asymmetric, irreflexive, and transitive. Alleged examples of grounding relations are: dispositions (e.g., fragility) are grounded in categorical features (e.g., molecular structure); semantic facts (e.g., Jones means addition by “+”) are grounded by non-semantic facts (e.g., Jones is disposed to draw certain inferences); mental properties (e.g., pain) are grounded by physical properties (e.g., c-fibers firing; see Rosen 2010 and Fine 2012). It has recently been proposed by Dasgupta that a version of the PSR could be formulated in terms of grounds. The proposal is formulated as follows: