  Let us now give some examples of the various pluralist/non-pluralist positions. At one extreme there is radical pluralism which maintains that all non-trivial theories in the interpretability hierarchy are on a par and that there are no theoretical reasons that one can give for any theory over another. This form of pluralism is difficult to articulate since, for example, assuming that Q is consistent the theory Q + ¬Con(Q) is consistent. But it is hard to see how the pluralist can admit this theory as a legitimate candidate since it contains a principle—namely, ¬Con(Q)—that is in conflict with the background assumption that the pluralist employs in arguing that the theory is a legitimate candidate. For this reason most people are non-pluralists about some domains but remain pluralists about others. 