Book excerpt: Designed to make life easier for most network designers, whether they are a manager with technical background, work with standardization, the architecture of implementers’ solutions to standards, product design (constructing the software and hardware parts of operator networks), system testing, and for operators responsible for the configuration and maintenance of a network. Develops modeling as a basic principle for producing specifications turns design from being document driven to model-driven. In the context of this book, however, the only model type that is discussed is the information model that describes the purpose, structure, and behavior of a network. Presents an added-value modeling language that called AMLn (Abstract Modeling Language, network view), which is the first and, so far, the only attempt to create a modeling language for network systems.