 One difference between theorists such as Strevens and Potochnik may lie in the nature of the explanandum. For Potochnik, it seems clear that the thing to be explained is a concrete, coarse-grained phenomenon: the behavior of a gas in a container, for example. For Strevens, it is a more abstract, fine-grained, and high-level event: the expansion of the gas. Thus for Strevens the thing to be explained is something along the lines of: that the gas expanded, not how it expanded. If one were to hold the explanandum consistent, there might be notable agreement between these views (though see Potochnik 2016 for further discussion).