 Thus, the problem is that mere structural similarity does not guarantee that both theories are actually concerned with the same phenomena, or the same properties. This is a problem Nagelian models do not face if they describe bridge-laws in semantic terms, i.e., in terms of extensional or intensional relations among the relevant predicates or kind terms. Relatively independent of structuralist models, philosophers who work at the interface of the philosophy of mind and the philosophy of science have developed accounts that later have been labeled ‘New Wave’ reductionism.