Renato De Mori graduated in electronic engineering from Politeuiso di Tovino, Italy. He has been active in research since 1969,and is a fellow of the IEEE. For this book he brings together developers of deployed systems and has co-authored each chapter to ensure coherence and homogeneity. Renato De Mori is Professor of Computer Science at the University of Avignon, France. He has also been a Director at the School of Computer Science, McGill University, Montreal, Canada for the last ten years.