1. One court’s review of another court’s proceedings and judgments). Typically, a higher court review of a lower court. Can also be a review of an administrative body’s factual or legal findings. The reviewing court can even award damages as well as uphold or reverse any order reviewed. 2. Supreme Court authority to decide constitutionality of a law. Until the constitution itself is amended to accommodate them, all unconstitutional laws are de facto null and void.