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There is an increasing need to perform systems-of-systems engineering (SoSE) in a global environment. A new SoSE process has been developed which is a significant breakthrough in the development of large complex systems and net-centric systems-of-systems (SoS). The SoSE process provides a complete, detailed, and systematic development approach for military and civil SoS. This architecture-centric, model-based systems engineering process emphasizes concurrent development of the system architecture model and system specifications. It is applicable to all phases of a system's lifecycle. The significant benefits of developing a system architecture model for GEOSS using the SoSE process are described. An example of how the process would capture the architecture model of GEOSS is presented.