Understanding the whole requires an understanding not only of the parts but also of the relationships between them. This statement comprehensively describes the field of integrative IT architecture management and the requirements that arise within it. This book addresses mechanisms for integrating existing IT architecture models in this context. The goal of integration is to create a means for mapping and evaluating the connections and dependencies of individual systems or sub-models, which would not be recognizable when considering the individual models in isolation. IT architecture management should not be seen as an end in itself, but rather as a type of integration and communication medium between different departments and their processes, as well as between various levels of abstraction and hierarchy within a functional area. It serves as a basis for decision-making and provides previously collected and processed information in a structured, analyzable, and integrated form, depending on the necessary level of detail.