Summary: GAO reviewed the National Nuclear Security Administration's (NNSA) progress in implementing key components of Title 32 of the National Defense Authorization Act for Fiscal Year 2000 including NNSA's reorganization efforts; integrated planning, programming, and budgeting improvements; use of its excepted service personnel authority; and efforts to improve its procurement practices. GAO found that although NNSA announced a new headquarters organization in May 2001, the reorganization did not clearly define the roles and responsibilities of the headquarters organizational units and did not address NNSA's field organization at all. More importantly, NNSA still lacks an overall organizational structure that clearly addresses long-standing issues such as the division of roles and responsibilities among headquarters offices and between headquarters and field staff. NNSA lost some momentum during the summer of 2001 as it reevaluated its efforts to develop a new planning, programming, budgeting, and evaluation process. NNSA now has established a conceptual process and begun to develop the necessary implementation plans and procedures. However, because of the broad scope of the work needed to develop these plans and procedures, it will be difficult to fully implement NNSA's process in time for the fiscal year 2001 budget cycle. Although it has developed an interim excepted service personnel policy, NNSA has firm plans to use only one-third of the 300 excepted service positions authorized by Title 32. Finally, NNSA believes that there is no need for an NNSA-specific procurement regulation, and it has begun to improve contractor oversight and performance evaluation.