Dr. David Ucko & Dr. Thomas Marks | The United States, and the West, struggle to understand and respond to irregular warfare, whether by states or nonstate actors. Attempts to master the art have generated much new jargon, ranging from “hybrid war” to “the gray zone,” and most recently “integrated deterrence.” The terminology belies a struggle to overcome entrenched presumptions about war—a confusion that generates cognitive friction with implications for strategy. To inform a better approach, this monograph presents an analytical framework to assess and respond to irregular threats.