Following Raven (2015), who applies the terminology to grounding and grounding explanations in particular, approaches to this fundamental question might be classified with regard to whether they take a “unionist” or “separatist” line. Standardly, unionism about grounding and grounding explanation is the thesis that they are one: to be grounded just is to be metaphysically explained in a distinctive way (e.g., Dasgupta 2014; Jenkins 2013; Litland 2013, 2017; Raven 2012; Rosen 2010; Thompson 2016)