This volume presents the papers and summarizes the discussions of a workshop held in Goa, India, in January 2004, organized by the Indian National Institute of Advanced Science (NIAS) and the U.S. Committee on International Security and Arms Control (CISAC). During the workshop, Indian and U.S. experts examined the terrorist threat faced in both countries and elsewhere in the world, and explored opportunities for the U.S. and India to work together. Bringing together scientists and experts with common scientific and technical backgrounds from different cultures provided a unique opportunity to explore possible means of preventing or mitigating future terrorist attacks.