In general metaphysics, his most important work is "Truth and Objectivity" (Harvard University Press, 1992). He argues in this book that there need be no single, discourse-invariant thing in which truth consists, making an analogy with identity. There need only be some principles regarding how the truth predicate can be applied to a sentence, some 'platitudes' about true sentences. Wright also argues that in some contexts, probably including moral contexts, superassertibility will effectively function as a truth predicate. He defines a predicate as superassertible if and only if it is "assertible" in some state of information and then remains so no matter how that state of information is enlarged upon or improved. Assertiveness is warrant by whatever standards inform the discourse in question.