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Integration engineering is the process of creating a coherent system from its component parts, both hardware and software, such that at each stage of integration the evolving system exhibits increased functional capability, while remaining under firm intellectual control. Integration is a major managerial, technical, and logistical task, requiring the combined efforts of people skilled in system engineering, hardware engineering, software engineering, and integration engineering. In large systems software may be the principal integrating element. This paper discusses integration engineering approaches including a software-first strategy, simulation approaches, and an incremental release strategy as well as a project example.