This book is an overview of how cognitive systems and artificial intelligence(AI) can be used in electronic warfare (EW). Readers will learn how EWsystems respond more quickly and effectively to battlefield conditionswhere sophisticated RF transmitters and spectrum congestion put a highpriority on EW systems that can characterize and classify novel waveforms,discern intent, and devise and test countermeasures. Specific techniquesare covered for optimizing a cognitive EW system as well as evaluatingits ability to learn new information in real time.