It is strongly recommended that a copy of the fourth edition is carried on board every tanker engaged in the carriage of chemical cargoes, and that copies are also held within shipping company technical departments. The production of the fourth edition has been a major project, drawing on expertise throughout the industry. As well as taking account of the latest industry best practice, large sections of the Guide have been totally rewritten, primarily with the aim of assisting seafarers' comprehension. The latest edition of the Guide takes full account of the adoption by the International Maritime Organization (IMO) in May 2014 of important amendments to the SOLAS Convention, following a major IMO review of tanker safety that has taken the best part of a decade. These amendments to SOLAS include new mandatory requirements for the inerting of chemical tankers. Together with recent changes made to the IMO Fire Safety Systems (FSS) Code these SOLAS amendments are fully reflected in the Tanker Safety Guide (Chemicals). Particular attention has also been given during preparation of the fourth edition to the question of how to instil an effective safety culture amongst everyone involved in chemical tanker operations.