By Hector V. In recent years, the emphasis in Maintenance Management has grown for various reasons, all very much related to the financial benefits that the owner of vessels and/or offshore installations will capture by paying much closer attention to Preventive maintenance than was normally contemplated in previous decades. The offshore oil field industry and ship owners/operators need to pay close attention to the development of international conventions containing regulations and classification society requirements regarding maintenance. Classification societies requirements to periodical surveys make possible to establish a survey arrangement for retention of class based on Planned Maintenance System (PMS) on board.