The organization of this Handbook moves deliberately from the theoretical to the more practical and applied chapters, and this final part takes us to the most practical. The contributions in this part are six chapters in which IDC is relevant to a prescribed domain of language use: translation, business, law, medicine, education, and religion. They also unite in many ways the other parts of the volume, in that in each chapter we see particular comparisons, theoretical approaches, and linguistic features. The chapters taken together show us that IDC research is important and can have life or death consequences. It is also meant, like chapters in many other sections, as a sampling of what can be done and as a way of quickly getting to know the shape of IDC in these domains. For researchers in these applied fields, it can provide a valuable first stop in defining the issues and finding the research relevant for their project.