A PCBU must consult, cooperate and coordinate with all others who hold a duty on the same chemical matter, so far as reasonably practicable (WHS Act s 46), exchanging information, finding out who is doing what and working together so risks are eliminated or minimised. For example, when a contractor brings hazardous chemicals on site the other duty holders should be told of the chemical use and each activity planned so that none creates risks for others.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.