Initially, a person seeking review of a Centrelink decision must request review by an Authorised Review Officer (ARO): s.129 of Social Security (Administration) Act 1999 (Cth) ("SSA Act"). The ARO will give the person a letter explaining their decision, the facts taken into account and the parts of the legislation or Centrelink guidelines followed in reaching the decision. If the person is dissatisfied with the ARO's decision, the next step is to appeal to the Social Security Appeals Tribunal (SSAT).