PAJA does not apply when an organ of state seeks to review its own administrative decision. The rights created by section 33 of the Constitution are enjoyed only by private persons, not by organs of state, and the State is the bearer of obligations under that section. PAJA, enacted pursuant to section 33(3) to give effect to section 33 rights, must be interpreted consistently with the Constitution, meaning 'administrative action' under PAJA has the same parameters as in section 33 of the Constitution. An organ of state cannot be both the beneficiary of rights under section 33 and the bearer of corresponding obligations to give effect to those rights. However, the principle of legality, as an incident of the rule of law and a founding constitutional value, provides a mechanism for organs of state to seek review of their own decisions where such decisions are inconsistent with the Constitution or law. Public power exercised contrary to the principle of legality is invalid under section 2 of the Constitution. Review proceedings under the principle of legality must be brought without undue delay, and unexplained delay may be fatal to such proceedings, though courts have discretion to overlook delay in appropriate circumstances. Under section 172(1)(b), courts have wide remedial powers to make any order that is just and equitable when declaring conduct constitutionally invalid.