 Given its prominence in the literature, the Brier score is a natural option. But using the Brier score to measure the reliability of credence-forming processes faces challenges. For example, Dunn (2015) and Tang (2016) object that if the Brier score is used, a credence-forming process that only outputs mid-level credences (say, a credence of .6) will never qualify as highly reliable; hence the credences it produces will never count as highly justified. Both Dunn and Tang object to this consequence. For instance, Tang argues that sometimes a particular input requires having a mid-level credence. If I have a vague visual experience of the silhouette of a horse, then it seems I should only have a mid-level credence that there is a horse in front of me: a credence of .6 in this proposition might well be justified, whereas a credence of 1 or 0 would not.