  An alternative conception emphasizes that the criteria should instead be the interaction of informality, truth, a prioricity, or perhaps even analyticity (Wright 2001: 759). In particular, platitudes need not take the form of an identity claim, equational definition, or a material biconditional. At the extreme, expressions can be as colloquial as you please so long as they remain true a priori (or analytically). These latter criteria are commonly appealed to, but are also not with problems. Firstly, a common worry is whether there are any strictly analytic truths about truth, and, if there are, whether they can perform any serious theoretical work. Secondly, these latter criteria would exclude certain truths that are a posteriori but no less useful to a platitude-based strategist.