In reflecting on the studies outlined in this book, we return to the KOSS research questions with respect to how the nature of powerful knowledge and epistemic quality in different school subjects can be characterized. We also consider how one may describe the transformation processes related to powerful knowledge and epistemic quality. As we do so, we develop a theoretical framework based on the concepts outlined earlier in the volume: powerful knowledge, transformation processes and epistemic quality. Our ambition with this book, and this chapter in particular, is to help create a common conceptual framework as well as a language for subject-specific research and scholarship as concerns different disciplines and school subjects. In this way, we try to find common ground for use by teachers, scholars and educational researchers interested in subject-specific research. In this final chapter, we will not once again...