 White explains that (RA) means “roughly that the mechanisms which led to her selection of a theory gave her a good chance of arriving at the truth” (2003: 664). (Thus White analogizes the theorist to an ‘archer’ who is more or less reliable in ‘aiming’ at the truth in selecting a theory.) Then White offers a simple argument for predictivism: assuming ~DS, ES provides evidence for RA. But assuming DS, ES provides no evidence for RA. Thus, heuristic predictivism is true.