Since Hughes' seminal work, other authors have also provided examples of reverse salients in different technological systems. In the ballistic missile technological development, where the systemic objective has been to increase missile accuracy, MacKenzie[9] has identified the gyroscope sub-system as a technical reverse salient. Takeishi and Lee[10] have argued that music copyright managing institutions have acted as a social reverse salient in the evolution of the mobile music technology system in Japan and Korea, where the objective was to proliferate mobile music throughout the end-user market.