 The main impetus behind dispositionalism is the discontent philosophers have with the categoricalist’s doctrine that the essence of a property doesn’t have to do with what its instances are disposed to do under various circumstances. Categoricalism—also known as categorical monism—is the position that all properties, or at least all sparse properties are categorical properties, which serves to underpin the traditional Humean metaphysic that asserts that worlds can be characterised in terms of their complete histories of instantiations of categorical properties (Lewis 1986, p. 162; Mumford 2006, p. 471; Williams 2011).