In mid-1980 a second conference for the review of the Non-Proliferation Treaty (NPT) would take place in Geneva. Given the importance of preventing, or at least slowing down, nuclear weapon proliferation, this conference would be a crucial event in the field of arms control and disarmament. For many countries the technical and economic barriers to proliferation had disappeared, and the only remaining barriers were political. In an attempt to contribute to the discussions at the NPT Review Conference, SIPRI assembled a group of experts from a number of countries to discuss the technical aspects of the control of fissionable materials in non-military applications. The meeting took place in Stockholm, 12-16 October 1978. Originally published in 1979, this book on nuclear energy and nuclear weapon proliferation contains the papers presented at the symposium and reflects the discussions at the meeting.