 The Integration Challenge (Peacocke 1999): This challenge is modelled after the Benacerraf Problem for  Platonism in the philosophy of mathematics.  According to Benacerraf (1973) any robustly realist (platonist) stance about mathematical objects like numbers regards them as abstract entities outside of space and time, i.e., as “platonic” entities. As such, they seem inaccessible to us. Unlike ordinary perceptible objects, to which we have a causal connection, it is unclear how we might detect platonic entities in order to know about them, since we have no causal connection to them. The possibilities and necessities that modal statements are about also seem to be outside of space and time and thus our epistemic access to them seems mysterious. So, on a par with the Benacerraf Problem in the philosophy of mathematics, the Integration Challenge in the philosophy of modality consists in providing a plausible account of how we know modal statements, which at the same time fits our modal metaphysics (see, e.g., Bueno &amp; Shalkowski 2000; Fischer 2018; Roca-Royes 2020 for discussion).