This highly anticipated report details the committee’s review and assessment of changes to technical issues that have occurred since the National Research Council’s previous report on this topic in 2002. The report addresses the ability of the United States to maintain the safety and reliability of the U.S. nuclear stockpile; the capability to detect, locate, and identify nuclear explosions; commitments necessary to sustain the U.S. stockpile and the U.S. and international monitoring systems; and potential technical advances countries could achieve through evasive testing will be discussed, among other issues. Following a presentation by committee chair Ellen Williams, members of the authoring committee will take questions from the audience.