This monograph reviews the basic concepts related to "deception." The author, Dr. Joseph Caddell, defines terms, provides historical examples, and discusses problems associated with deception. His monograph provides a general overview, a "primer," and is not directed at those who already possess a working knowledge of deception operations. Nevertheless, given the complex and ever changing nature of deception in the political-military environment, it may serve as a useful reminder of the basic assumptions and methods concerning the subject. The Strategic Studies Institute is pleased to publish this work as part of our External Research Associates Program.