It is our hope that this book will prove useful both to professional graph theorists interested in the applications of their subjects, and to engineers in the particular areas who may want to learn about the uses of graph theory in their own and other subjects. The book is also intended for both graduate and postgraduate students in fields such as mathematics, computer science, system sciences, biology, engineering, cybernetics, and social sciences, and as a reference for software professionals and practitioners. The wide scope of the book provides them with a good introduction to the latest approaches of graph theory, and it is also the source of useful bibliographical information.