This course examines the problem of preventing the proliferation of nuclear, chemical, and biological weapons, delivery systems, and associated technologies. The course addresses these issues historically, technically, and analytically. The first part of the course focuses on nations and technologies of concern, why they are, and what specific security threats proliferation poses. The second part examines how we have attempted to prevent proliferation and what successes and difficulties we have had in these efforts. The final part examines what other approaches might be taken to mitigate proliferation economically, politically, and militarily.