 This approach using consistency (or coherence) plus self-knowledge of belief gives a way of representing what a state of self-doubt is. It sensibly implies that it is irrational to stay in such a state but it also implies that it is irrational to be in it in the first place, making it unclear how self-doubt could be a reason to revise. The approach identifies a kind of matching that rationality demands: give no more credence to the possibility that one is a bad judge of q than one gives to not-q. However, it leaves other questions unanswered. If the rational subject finds herself doubting her judgment, should she defer to her first-order evidence, or her second-order evidence about the reliability of her first-order judgment? What are the rules by which she should decide, and how can they be justified?