 There are two main ways in which one might respond to Mackie’s argument for the error-theory: directly, via contesting one of its premises or inferences, or indirectly, pointing to some internal tension within the error-theory itself. Some possible direct responses have already been mentioned, responses which reject either the conceptual or ontological claims that feature as premises in Mackie’s argument for the error-theory. An indirect argument against the error-theory has been developed in recent writings by Crispin Wright (this argument is intended to apply also to Field’s error-theory of arithmetic).