As seen in the “pattern theories” discussed in section 4.3, approaches to biological and other scientific kinds are sometimes extended to social categories. Some participants in these debates, including Dupré (1995) and Hacking (2007), argue for a sweeping pluralism about scientific kinds: they contend that there are myriad kinds of kinds, and that it is an error to regard some kinds as more “natural” than others. Others argue for a more modest form of pluralism. Ereshefsky and Reydon (2015) a