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Over the past decade, the complexity of new and acquired systems of systems has increased dramatically. Until now, research has mainly focused on the properties of systems of systems. Recently, paradigms such as service oriented architecture (SOA) and Grid computing are being adopted to implement systems of systems. Additionally, techniques such as SoS Navigator are being developed to identify complexrelationships among organizations participating insuch systems of systems. However, there is no unifiedbody of knowledge that captures the engineeringpractices necessary for creating and managing systemsof systems. Further research is required to build this body of knowledge, but two main challenges must be addressed.