“…Ren and Yeo (2006) suggest that the CoPS classification can be sub-divided into complex products and systems, with complex products being standalone entities and systems being complex products that are fully integrated in a system (Ren and Yeo, 2006). The distinction between a complex product and a system is, however, somewhat blurred, e.g., a train can be seen as a complex product but generally operates as part of a system (a network) (Ren and Yeo, 2006). The same distinction is also apparent for aerospace, IT and telecommunications products, where individual products are invariably combined into systems, fleets or networks.…”