CONSTELLATION SPACE SUIT SYSTEMS THE PURPOSE OF THE CSSS CONTRACT IS TO DESIGN, DEVELOP, TEST EVALUATE, CERTIFY AND PRODUCT, PROCESS AND PROVIDE SUSTAINING ENGINEERING FOR HARDWARE AND ASSOCIATED SOFTWARE TO SUPPORT THE MULTIPLE CONSTELLATION MISSION REQUIREMENTS. SPECIFICALLY THE CSSS HARDWARE WILL PRODUCE FOR LEA AND O-G EVA CAPABILITY FOR INDIVIDUAL CREWMEMBERS DURING ORION MISSIONS. ADDITIONALLY, THIS CONTRACT WILL PROVIDE HARDWARE FOR CREW SURVIVAL AND SURFACE EVA CAPABILITY FOR LUNAR MISSIONS TO SUPPORT THESE CAPABILITIES, THE CSSS CONTRACT WILL INCLUDE SPACE SUITE HARDWARE, VEHICLE INTERFACE HARDWARE, GROUND SUPPORT EQUIPMENT, (GSE) AND ANCILLARY EVA RELATED HARDWARE. THE CSSS CONTRACT IMPLEMENTATION STRATEGY REQUIRES A PHASED DEVELOPMENT AND CERTIFICATION APPROACH TO COMPLEMENT THE PHASED CXP MISSION REQUIREMENTS WHILE MINIMIZING THE NECESSITY TO DEVELOP MULTIPLE UPGRADES AND/OR CONTINUALLY RECERTIFY EVA ELEMENTS. THIS IS ACHIEVED BY IMPLEMENTING A SPACE SUIT SYSTEM CONSISTING OF A MINIMUM SET OF HARDWARE REQUIRED TO MEET ALL MISSION PHASE REQUIREMENTS. THIS IS EXECUTED BY DEVELOPING A SET OF COMPONENTS WITH AS MUCH COMMONALITY BETWEEN MISSION PHASES AS TECHNICALLY PRACTICAL AND PROVIDING A MODULAR, OPEN ARCHITECTURE DESIGN TO ALLOW FOR COST EFFECTIVE UPGRADES. THE RESULTING SPACE SUIT SYSTEM CONCEPT WILL REDUCE THE NUMBER OF SUIT COMPONENTS THAT DIFFER BETWEEN EACH MISSION PHASE, THEREBY REDUCING OVERALL UP-MASS AND LIFE CYCLE COST.