I left off the previous piece having discussed an account of explanation and its limits, as well as an explication of scientific realism and constructivism. These are co-existing narratives of what science is that both “fit the data” (nature is underdetermined), but they are radically different in their commitments and beliefs, and as we shall see provide examples of incommensurability. A deeper understanding of this is what we aim for in the following discussion of incommensurability and world views. Aspects of the constructivist stance to science and the epistemic should remind us of the concept of epistemisation first brought up in Wittgenstein and the Private Language Argument, and the discussion about what world views are and how they relate to reality will naturally bring us back to a more in-depth treatment of this concept.