Some time ago I wrote a book (Moral Language, 1982) in which I argued that moral judgments are capable of being true ('truth-apt, ' to use a current phrase, or descriptive and having truth-value, to use a more traditional term), that the methods of discovering moral facts are fundamentally similar to those of discovering non-moral facts, and that moral judgments may be true. What I did not do at that time was to develop a moral theory which would demonstrate how the method of discovering moral truths would work and what the criteria of truth actually are. In a later work (Persons, Animals,...