 Ye argues that (CCB) has considerable explanatory power. In particular, it is said to avoid the problem deviant causal chains. Consider Plantinga’s example of Sylvia: your belief that your leg hurts, though caused by seeing Sylvia enter the room, is not based on it because you lack the belief that seeing Sylvia supports your belief that your leg hurts. It may also help with clarifying the distinction between triggering causes and structural causes: the latter play a different causal role than the former. In the case of (CCB), the structuring causes include the belief to the effect that R is a good reason to believe that p.