Glennan (1996, 2009) sees causation (at least non-fundamental causation) as derivative from the concept of mechanism: causal claims are claims about the existence of a mechanism. The truth-maker for a causal claim at one level of organization is a mechanism at a lower level. In short, mechanisms are the hidden connexion Hume sought between cause and effect. Like the Salmon-Dowe account, Glennan’s view is singular: particular mechanisms link particular causes and particular effects (Glennan forthcoming)