Psychologists should avoid taking goods, benefits or other non-monetary payment from clients for services. If they reasonably believe a cultural or ethical obligation requires them to accept it, professional behaviour means the psychologist: (a) tells all relevant parties about the potential conflicts of interest and what they could mean; (b) sets a fair value on the non-monetary payment; (c) monitors the arrangement and takes reasonable steps to protect clients' interests; and (d) keeps contemporaneous records of how the situation was managed.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.