 Cornell realism holds that moral properties cannot be a priori analyzed as any natural properties, though they can be empirically discovered to be identical to certain natural properties. In contrast, analytic naturalism holds that moral properties can be analyzed in terms of natural properties. One influential version of analytic naturalism applies to moral properties a strategy that was developed for dealing with mental properties, which is why the view is also called moral functionalism, flagging the similarity to functionalism in the philosophy of mind. We will focus on this version of analytic naturalism, specifically Frank Jackson’s (1998) exposition. (For another version see Stephen Finlay 2014.)