If your visa is refused or cancelled, you might be able to have the decision reviewed by a merits review tribunal. The AAT is an independent organisation that reviews government decisions. Within the AAT, specialist offices review specific types government decisions.
Departmental decisions are usually reviewed within the AAT’s: General Division, which reviews decisions relating to:
character matters (including section 501 of the Migration Act 1958)
citizenship matters; or
Office of the Migration Agents Registration Authority (OMARA) matters. Migration and Refugee Division (MRD), which reviews decisions relating to most migration and refugee visa refusals (including refusal of sponsorship or nomination) and visa cancellations. Immigration Assessment Authority, an independent office within the AAT’s MRD that reviews fast track reviewable decisions relating to certain Protection visa decisions