This report explores new approaches to verifying and monitoring North Korea's nuclear arsenal. The authors, Joshua H. Pollack, Marc-Gérard Albert, Alex Glaser, Thomas MacDonald, and Melissa Hanham, propose various strategies for monitoring North Korea's missile programs, nuclear program, nuclear warheads, and future agreements. The report was made possible by a grant from the Korea Foundation and is published by the Carnegie Endowment for International Peace. The authors do not take institutional positions on public policy issues and the views represented in the report are their own. The report can be downloaded for free at CarnegieEndowment.org.