 Given a particular scoring rule R, we can develop a measure of process reliability (Dunn 2015; Tang 2016; Pettigrew 2021). Let X be some credence-forming process: that is, a process that outputs credences in a range of propositions. We can use R to score all of the credences that X produces. Average all of these scores, and we have a measure of X’s degree of reliability. Process reliabilists can then use this measure of reliability to give an account of justification for credences: a credence is (prima facie) justified iff it is produced by a reliable credence-forming process.