Modern systems engineering projects have moved from the development of new virgin, standalone products, to the upgrade and adaptation of existing systems to new capabilities. Enterprise systems are in a state of flux as new capabilities and improvements are implemented over time. They are characterized by complex technology acquisition and supply chains, variable, overlapping timescales, and numerous asset management and maintenance processes all whilst dealing with the pressures of minimal system downtime, maintaining operability and safety, and providing a reliable service. The organisations...