 Susan Dwyer was the pioneer in introducing Turiel’s work to philosophers. In her 1999 paper, “Moral Competence”, she proposed an analogy between the psychological mechanisms underlying moral competence and Chomsky’s account of the psychological mechanisms underlying linguistic competence. The universality of the moral/conventional distinction and the fact that it emerges very early in development, Dwyer argues, are both best explained by the hypothesis that “children come equipped with something akin to a Universal Moral Grammar” (Dwyer 1999: 169). Prior to Dwyer’s paper, references to Turiel and other social domain theorists were infrequent in the philosophical literature, and we know of no substantive discussions of the philosophical implications of their findings. But that soon changed.