 A coherence norm states how one’s opinions ought to fit together on pain of incoherence. Most Bayesians agree that the correct coherence norms include at least Probabilism, but they disagree over which version of Probabilism is right. There is also the question of whether there are correct coherence norms that go beyond Probabilism and, if so, what they are. Those issues were only sketched in the tutorial  section 1.4.  They will be detailed in this section.