 A general worry about the hylomorphist approach might be put as follows. The modern hylomorphists do not claim to be interpreting Aristotle, but to be inspired by his concept of form. This means that it is out of place simply to argue that they have not interpreted him in a scholarly fashion. Nevertheless, it is relevant to point it out if they have totally misunderstood his deployment of the concept of form, for if this is the case, it might suggest that they are pretending to a solution to the composition problem that they do not possess. Someone who was sceptical about their claim to a solution might start by pointing out that all the moderns reject the ’traditional’ Aristotelian idea that form has a role as an efficient cause, actually making a difference to the way that its matter behaves. They deny this because they all want their theories to be consistent with the closure of the world under physics. At the same time, they seem to intend their composites to have full ontological weight, and to have causal efficacy.