Switching theory refers to the abstract mathematical formalization used in the logic design of digital networks. The modern logic networks are usually constructed using electronic integrated circuits (ICs) which consist of logical elements such as inverters, AND gates, and OR gates. The basic component of modern digital system is two-valued Boolean algebra, sometimes referred to as switching algebra. It is used as a notation to represent the operation of such logic networks. Boolean algebra performs three basic operations. These include inversion, logical addition, and logical multiplication. These operations are implemented directly by logic gates called inverters, OR gates, and AND gates. Switching theory plays an instrumental role in data processing, telephone, and other technologies wherein the decisions are made about routing information. This book provides in-depth knowledge of switching theory and logic design. Researchers and students in the field of electronics and communication, and electrical engineering will be greatly assisted by it.