A--SPACE LAUNCH SYSTEM ADVANCED BOOSTER ENGINEERING DEMONSTRATION AND RISKREDUCTION

This is a modification to the synopsis entitled Space Launch System AdvancedBooster Engineering Demonstration and Risk Reduction which was posted on November 10,2011. You are notified that the following changes are made: This special notice is provided in order to clarify that all activities associated withthe Space Launch System Advanced Booster Engineering Demonstration and/or Risk Reductionacquisition will be categorized under NAICS Code 541712 Research and Development in thePhysical, Engineering, and Life Sciences (Except Biotechnology), with an industry sizestandard of 1,000 employees versus 336415, Guided Missile and Space Vehicle PropulsionUnit and Propulsion Unit Parts Manufacturing, with 1,000 employees.This special notice is for information and planning purposes only and is not to beconstrued as a commitment by the Government. NASA will continue to inform industry, asappropriate.