This document provides guidance on the interpretation and application of the term ‘reasonably practicable’ in considering the standard of health and safety that a person conducting a business or undertaking (the duty-holder) is expected to meet under the Work Health and Safety (WHS) Act and Regulations. ‘Reasonably practicable’ is used to qualify duties to ensure health and safety and certain other duties in the WHS Act and Regulation. This standard and what is required to meet it in relation to a health and safety duty are set out in section 18.