High Quality Content by WIKIPEDIA articles! MEDUSA, (in its Fourth Generation incarnation, since 2004, known as MEDUSA4) is a CAD program used in the areas of mechanical and plant engineering by manufacturers and Engineering, Procurement and Construction (EPC) companies. The system`s history is closely tied to the very beginnings of mainstream CAD and the research culture fostered by Cambridge University and the UK government as well as the resulting "Cambridge Phenomenon"