 The project is complicated by the fact that vague partial beliefs interact with precise beliefs (MacFarlane 2010). Consider a statement that has a mixture of vague and precise conjuncts: ‘Donald is old and bald and has an even number of hairs’. Adding the extra precise conjunct should diminish confidence. Schiffer also needs to accommodate the fact that some speakers are undecided about whether the nature of the uncertainty involves vagueness. Even an idealized speaker may be unsure because there is vagueness about the borders between vagueness related uncertainty and other sorts of uncertainty.