On Oct. 31 to Nov. 4, 2006, a delegation led by Prof. John W. Lewis, Stanford University, accompanied by Siegfried S. Hecker and Robert L. Carlin of Stanford University, and Charles L. (Jack) Pritchard of the Korean Economic Institute visited Pyongyang, Democratic People's Republic of Korea (DPRK). This report summarizes the findings regarding the DPRK nuclear program based on our discussions with officials from the Ministry of Foreign Affairs, the Korean People's Army, the Supreme People's Assembly, and the Yongbyon Nuclear Scientific Research Center. Three members of our delegation made similar visits to the DPRK in January 2004 and August 2005. Before and after the current trip to the DPRK, Lewis and Hecker also had extensive discussions about the DPRK nuclear program with Chinese officials from the Ministry of Foreign Affairs, the military, the Central Party School, the China Reform Forum, the China National Nuclear Corporation, and the Institute of Applied Physics and Computational Mathematics.