In modern communication networks with stored program control the implementation of sophisticated traffic control rules is worthwhile. This allows efficient sharing of existing resources and often defers network extension. Moreover, the flexible control adapts well to changing load conditions during periods of overload and equipment failure. When these benefits become evident, many network administrations start to implement corresponding solutions. This book attempts to provide a systematic approach to the analysis and synthesis of advanced traffic control concepts. Because the book is oriented toward engineering applications, mathematical concepts are often illustrated with examples. The reader is assumed to be familiar with advanced calculus, differential equations and probability theory to engineering level.