A congressionally mandated study carried out in 2013-2014 led to the November 2014 report A New Foundation for the Nuclear Enterprise. That report summarizes the panel's findings on the current health of the enterprise, examines the root causes of its governance challenges, and offers the panel's recommendations to address the identified problems. It concludes that the existing governance structures and many of the practices of the enterprise are inefficient and ineffective, thereby putting the entire enterprise at risk over the long term. It offers recommendations to put the entire nuclear security enterprise on a stronger footing. Recognizing the persistence of governance and management concerns, this report serves as an initial assessment of the implementation plan developed by the National Nuclear Security Administration and the Department Of Energy for addressing the recommendations from A New Foundation for the Nuclear Enterprise. There will be seven semi-annual interim reports to evaluate progress in implementing the plan. A final report will be issued at the end of the study to document the overall progress in executing the implementation plan, assess the effectiveness of the reform efforts under that plan, and recommend whether further action is needed.