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Ultra-Large Scale Software-Intensive Systems (ULSSIS) are integrated networks of capabilities that serve large communities of stakeholders and have a broad spectrum of crosscutting concerns. The added value of an ULSSIS emerges from the interplay of a set of constituent systems, both existing and emerging systems. The authors see the systems-of-systems integration challenge as a major concern for ULSSIS. System integration has to address systematic and seamless composition of services, consider upfront crosscutting concerns such as policy and security, assure system dependability and quality of service, and show agility to deal with changes in the requirements and the environment in which the ULSSIS operates.
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