(1)  A decision-maker, in relation to a reviewable decision, is the person or body that makes (or is taken to have made) the decision under the enactment concerned.

(2)  The person or body specified by an enactment as a person or body whose decisions are reviewable decisions is taken to be the only decision-maker in relation to the making of a reviewable decision even if some other person or body also had a role in the making of the decision.