Naval Surface Warfare Center Dahlgren Division; under joint sponsorship of the Office of Naval Research; the Naval Command, Control, and Ocean Surveillance Center; and the Naval Surface Warfare Center; has initiated a thrust to examine the ongoing trends in engineering complex systems, to enrich and enhance the state-of- the-art in engineering methods and practices, and to facilitate the implementation of desired improvements. To support that thrust, the Second Annual Workshop on Engineering of Systems in the 21st Century: Facing the Challenge was held in June 1995. One hundred and seventy five technical and organizational leaders from industry, government agencies, and academia were invited. Each participated in one of thirteen Focus Groups. This paper summarizes the results of the Domain Engineering Focus Group.