Reasonably practicable means (except in relation to obligations for consultation) that which is, or was, at a particular time reasonably able to be done in relation to ensuring health and safety, taking into account and weighing up all relevant matters, including:
the availability and suitability of ways to eliminate or reduce the hazard, the harm or the risk; and
the costs associated with the available ways of eliminating or reducing the hazard, the harm or the risk, including whether the cost is grossly disproportionate to the degree of harm and the risk.
We also recommend that the definition of reasonably practicable be supported by guidance material, explaining the process, to assist an understanding by duty holders and others of the requirements.123