 According to another hybrid approach, the internal logical or probabilistic relationships do not mirror the relationships out there in the world, but rather provide evidence for the existence of relationships out there in the world. Thus some hold that when things go well an appreciation or grasp of the probabilistic connections among the various things we believe allows us to infer the existence of real causal connections in the world (see Spirtes, Glymour, &amp; Scheines 1993; Pearl 2000 [2009]). As Wesley Salmon characterizes an earlier version of this idea,