 A significant contribution of Millikan’s approach is the constitutive role of particular tokens in the world in setting up the kinds of which they are members. In her approach, the kind marriage is partly set up by millions of particular marriages copied one from another in a reproductively established family. Particular marriages—the actual members of the kind—figure into setting up the kind marriage to have the membership conditions it does. Contrast this with a mentalistic account of the kind marriage. According to that sort of theory, particular marriages are members of the kind, and may play a causal role in triggering people to have certain attitudes. But it is the attitudes that define the kind; the tokens do not play an ontological role. Thus Millikan proposes a more “world-involving” and less mentalistic theory of how kinds are set up. Also see Burge 1986 for a similar insight.