 Note that this argument turned essentially on adopting the version of (MA) which appealed to a single world, rather than a set of worlds. So one way of responding to this objection is by appealing to sets of worlds in the modal analysis of ability. This is precisely the proposal of Mark Brown, who argues that, if we take accessibility relations to hold between a world and a set of worlds, then we may capture talk of ability within a possible worlds framework that is broadly in the spirit of standard views (Brown 1988; see also Cross 1986). Alternatively, we may take this sort of point to militate in favor of a return to hypothetical theories of ability, since, at least on Lewis’s view of subjunctive conditionals, it may be that a disjunction follows from a counterfactual claim without either of its disjuncts following from that claim (Lewis 1973, 79–80). Modal accounts that appeal to sets of worlds are ‘non-normal’ in the sense that they do not satisfy the axiom K, but they remain true to the letter of (MA) as well as the spirit of modal analyses generally, insofar as they avail themselves only of possible worlds and quantification thereover.