 The mainstream in the philosophy of mind is, apparently, one version or another of non-reductive physicalism. The majority within the philosophy of science has nowadays abandoned the unificationist program, to which reduction was intimately connected right from the start. However, as became apparent only in recent years, some questions regarding the concept of reduction have not successfully been accounted for yet, and recent developments in metaphysics in connection with metaphysical grounding may shed new light on the concept of reduction.