 In any event, this debate does not really seem to be about the metaphysics of causation. As we saw in the previous section, causal relevance is really the basic metaphysical concept. The dispute between Dupré and Eells is really a debate about how best to use the word ‘cause’ to pick out a particular species of causal relevance. Dupré’s proposed usage will count as (positive) causes many things that will be mixed causes in Eells’s proposed usage. But there does not seem to be any underlying disagreement about which factors are causally relevant. (For defense of a similar position, see Twardy and Korb 2004.)