 In the face of these difficulties, some philosophers have sought to develop accounts of the class of properties which subvene the ethical which are substantive enough for ethical supervenience to do dialectical work, but avoid some of the difficulties just sketched. For example, it has been proposed that the ethical supervenes on the disjunctive class of non-ethical or descriptive properties (Ridge 2007). In the context of discussing arguments concerning supervenience and non-naturalism, it has been proposed that the ethical supervenes on the set of properties that are not ethical properties as those are understood by the non-naturalist (McPherson 2012).