Networks can be found in all areas of life, yet they are as omnipresent as they are conceptually empty. The resulting diffuseness contributes to the discrepancy between theory and practice in social work. The increasingly urgent questions regarding delineation, definitional narrowing, and contemporary diagnostic embedding that arise in the course of the development of the concept of networks are fundamentally addressed in this book. When one speaks of networks, one can quickly be assured of numerous listeners and a variety of reactions. They are present in all areas of life, yet as omnipresent as they are conceptually empty. This resulting diffuseness becomes evident on various levels, especially when understanding network orientation as a fundamental idea of social work. Accordingly, urgent questions continue to arise in the course of establishing and developing the concept of networks.