 Processes and conjunctive and interactive forks are the ingredients of the mechanistic picture of the world that Salmon had in mind. Conjunctive and interactive forks represent two different ways in which processes can intersect one another, and fulfill different tasks within Salmon’s perspective. Thanks to their screening off capacity, conjunctive forks detect order and asymmetries among the causal connections forming mechanisms, whereas interactive forks are the sites of causal production. The temporal asymmetry characterizing conjunctive forks is absent from interactive forks, which describe physical interactions taking place at a certain moment in a certain place. Interactive forks are more basic than conjunctive forks, because they express a causal concept which can be “explicated without recourse to other causal concepts” (Salmon 1994b [1998: 249]). Salmon called attention to the fact that