More than one organisation can hold the same WHS duty at the same time because they share activities, workplaces or owe duties to the same people, and each keeps responsibility to the extent it can influence and control the matter. Duty holders must consult, cooperate and coordinate so far as reasonably possible (WHS Act s 46), and it is best to settle how risks will be managed before work starts, with arrangements built into contracts, although each organisation keeps its own primary duty. In the aged care example, a facility that owns and maintains the kitchen equipment but does not control a catering company's day-to-day work consults the caterer about its WHS systems, and the caterer cooperates by verifying training, safe food handling, manual handling protections and PPE, while the facility ensures after-hours security access, passes and vaccination and emergency training. In the disability support example, management consulted staff about workload, published service standards that exclude out-of-scope services and allocated complex clients fairly.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.