  W.D. Ross is a foundational pluralist in a rather complex way. Most straightforwardly, Ross thinks that there are several prima facie duties, and there is nothing that they all have in common: they are irreducibly plural. This is the aspect of Ross’s view that is referred to with the phrase, ‘Ross-style pluralism’. However, Ross also thinks that there are goods in the world (justice and pleasure, for example), and that these are good because of some property they share. Goodness and rightness are not reducible to one another, so Ross is a pluralist about types of value as well as about principles.