Dr. Pawan Singh has done B.E., M.Tech. and Ph.D. Currently, he is working in the Department of Computer Science and Engineering, Amity School of Engineering and Technology, Amity University, Lucknow Campus. His teaching, Industry, and research experience is more than seventeen years. His research interests include software metrics, software testing, software cost estimation, web structure mining, energy-aware scheduling, energy management, nature-inspired meta-heuristic optimization techniques, and its applications. He has authored and co-authored a number of research papers and book chapters in the journals and books of international reputation. Dr. Baseem Khan has done B.E., M.Tech. and Ph.D. .. Currently, he is working in the School of Electrical and Computer Engineering, Hawassa University Institute of Technology, Hawassa University, Hawassa, Ethiopia. His research interest includes power system restructuring, power system planning, smart grid technologies, meta-heuristic optimization techniques, reliability analysis of renewable energy system, power quality analysis, and renewable energy integration. He has published several research papers and book chapters in internationally renowned journals and publishers. --This text refers to the paperback edition.