I should first thank the authors and acknowledge their contributions to the book, as well as their support and patience. I would also like to thank the reviewers for their useful comments and suggestions that helped in improving the earlier outline of the book and presentation of the material. I should extend my deepest thanks to Professor Hamid R. Arabnia (the series editor of Emerging Trends in Computer Science and Applied Computing) for his encouragement and support to start this project, and Amy Invernizzi (the editorial project manager) for her collaboration, guidance, and patience in finalizing this volume. Last but not the least, I am very grateful to the lovely team from Elsevier’s production department for their extensive efforts during the many phases of this project and the timely fashion in which the book was produced.