This publication is endorsed by NEBOSH as offering high quality support for the delivery of NEBOSH qualifications. NEBOSH endorsement does not imply that this publication is essential to achieve a NEBOSH qualification, nor does it mean that this is the only suitable publication available to support NEBOSH qualifications. No endorsed material will be used verbatim in setting any NEBOSH examination and all responsibility for the content remains with the publisher. Copies of official specifications for all NEBOSH qualifications may be found on the NEBOSH