Whereas under previous legislation the Principal would often pass on the risk under the HSWA it is expected that a PCBU at the top of a contracting chain is a leader in encouraging and promoting good health and safety practices throughout the supply chain. They are also expected to establish sound contractor management processes. 

Processes may include, choosing competent contractors, exchanging H&S information, planning and monitoring carefully, and using post contract review.

A business must control any overlap and risks that are appropriate for them to control. The nature of that control will reflect how much influence and control the business has, and what is reasonably practicable in the circumstances. 

HSE can assist businesses in establishing H&S controls that are risk based, reasonable, practicable and enhance safety for all.