  For this kind of view to yield the right results, we cannot count as ‘being able to predict a process’ if we merely guess rightly about its outcomes. For that reason, prediction must involve some notion of reasonableness; it must be rational for the agent to make the predictions they do. For example, Eagle (2005: 770) insists that it is the physical theory accepted by the predicting agent that makes certain posterior credences reasonable; simply guessing will not be reasonable, even if it’s correct.