Since 2002, Congress has directed GAO to assess the Missile Defense Agency's (MDA) annual fiscal year cost, schedule, testing, and performance progress in developing the Ballistic Missile Defense System (BMDS). This year's report specifically assesses MDA's progress in (1) delivering missile defense assets as scheduled (2) improving accountability and transparency over the past year (3) implementing the European Phased Adaptive Approach (4) implementing changes to the Ground-based Midcourse Defense program (5) implementing the targets revised acquisition strategy identified in 2009, and (6) testing the BMDS and developing its modeling and simulations to assess performance. To accomplish this, GAO reviewed MDA's progress reports to the Congress, pertinent Department of Defense (DOD) policies and reports including a DOD assessment and plan related to the Ground-based Midcourse Defense system. GAO makes 10 recommendations for MDA to strengthen its resource, schedule and test baselines, facilitate baseline reviews, and further improve transparency and accountability. GAO is also making a recommendation to improve MDA's ability to carry out its test plan. In response, DOD fully concurred with 7 recommendations. It partially concurred with 3, contending that its current actions are sufficient and that the test recommendation is also not affordable. GAO continues to believe that additional action is needed.