  In assessing a criteriological argument, we need to ask not only whether the event in question meets the criteria but also whether the criteria themselves are good indicators of truth. An argument for the criteria that Leslie gives cannot proceed wholly a priori, since there is not a necessary connection between an event’s satisfying the criteria and its being true. In this case, perhaps the most promising approach would be to argue that the criteria effectively rule out explanations other than the truth of the claim. Leslie’s remarks suggest that this is the direction he would go if challenged, but he does not offer a fully developed defense of his criteria.