 There’s been a long history of comparing moral theories to other sorts of theories, such as scientific ones. For example, in meta-ethics one issue has to do with the nature of moral “evidence” on analogy with scientific evidence.   On what Ronald Dworkin terms the “natural model” the truths of morality are discovered, just as the truths of science are (Dworkin 1977, 160). It is our considered intuitions that provide the clues to discover these moral truths, just as what is observable to us provides the evidence to discover scientific truths. He compared this model with the “constructive model” in which the intuitions themselves are features of the theory being constructed and are not analogous to observations of the external world.