1. Origins and principles of reliability and risk-based maintenance policies

1.1 Preamble

European standard EN-13306 defines maintenance as "all technical, administrative and management actions during the life cycle of an asset, intended to maintain or restore it in a state in which it can perform the required function". It also defines maintenance objectives as "the goals set and accepted for maintenance activities". Based on these general definitions, maintenance policies have been developed in industrial sectors to achieve specific objectives. For example,...