THIS TASK ORDER IS TO CONTINUE MSFC SPECIALIZED ENGINEERING SUPPORT BY THE SAME CONTRACTOR. THE CONTRACTOR CHANGED THEIR COMPANY NAME; THEREFORE A NEW TASK ORDER NUMBER WILL BE ISSUED WITH THE NEW NAME. THE CONTRACTOR SHALL PROVIDE ENGINEERING SUPPORT TO THE MARSHALL SPACE FLIGHT CENTER (MSFC) ENGINEERING DIRECTORATE INCLUDING BUT NOT LIMITED TO THE DESIGN, DEVELOPMENT AND DEFINITION OF THE FLIGHT CONTROL SYSTEM, GUIDANCE, NAVIGATION, AND SEPARATION SYSTEMS IN SUPPORT OF SPACECRAFT AND LAUNCH VEHICLES INCLUDING SYSTEM AND SUBSYSTEM REQUIREMENTS AND SPECIFICATIONS. THE CONTRACTOR SUPPORT SHALL INCLUDE BUT IS NOT LIMITED TO MATHEMATICAL MODELING, COMPUTER SIMULATION, ALGORITHM DEVELOPMENT, CODE DEVELOPMENT, ASCENT AND REENTRY FLIGHT DYNAMICS ANALYSIS, COUPLED FREQUENCY AND TIME DOMAIN STABILITY CONTROL SYSTEM ANALYSIS, AERODYNAMICS ANALYSIS, MANUAL STEERING CONCEPT EVALUATION, SIMULATION VISUALIZATION SUPPORT, FLIGHT CONTROL SYSTEM AND FILTER DESIGN AND PERFORMANCE OPTIMIZATIONS, GUIDANCE AND NAVIGATION ARCHITECTURE DESIGN AND ANALYSIS SUPPORT AND MULTI-BODY VEHICLE FLIGHT SEPARATION DYNAMICS ANALYSIS. THE CONTRACTOR SHALL PARTICIPATE IN REQUIREMENT REVIEWS, TECHNICAL MEETINGS AND WORKING GROUPS AS WELL AS SUPPORT THE DEVELOPMENT OF PRESENTATION AND DOCUMENTATION DATA.