This book is the material used in the widely acclaimed course offered at Stanford University. Drawing concepts from each constituent subfields that collectively consist of information science, Luenberger build his book around five "E" information: Entropy, Economics, Encryption, Extraction, and Emission. Each area directly impacts modern information products, services, and technology - everything from word processors to digital cash, a database system for decision making, marketing strategy to spread spectrum communication. To learn these principles is to learn how the English language text, music, and images can be suppressed, how is it possible to build a digital signature that can not be simply copied, how beautiful the photos can be sent from a distant planet with a small battery, how communication networks expand, and how producers of information products can make a profit under difficult market conditions. This book contains real world examples, illustrations, exercises, and historical points of interest, which all turn on the analytical method is presented: Presenting a unified approach to information science Emphasizes basic principles include various examples and applications help students develop critical skills training with the Propose new solutions in the instructor's manual