Reengineering legacy systems towards system of systems development

Despite the evolution of the hardware that enabled even small components to interconnect and the modern software engineering paradigms that eased information exchange, several systems still operate standalone and do not share resources naturally with each other. In this paper, we show that if these systems are reengineered appropriately using existing techniques, they can share useful resources, work cooperatively, and compose more complex systems like System of Systems (SoS). Our case study illustrates how distinct Electronic Funds Transfer (EFT) legacy systems were reengineered to compose a SoS intended to deliver an increasing number of financial operations.