 Many scientists believe that replication is epistemically valuable in some way, that is to say, that replication serves a useful function in enhancing our knowledge, understanding or beliefs about reality. This section first discusses a problem about the epistemic value of replication studies—called the “experimenters regress”—and it then considers the claim that replication plays an epistemically valuable role in distinguishing scientific inquiry. It lastly examines a recent attempt to formalise the logic of replication in a Bayesian framework.