1. ADJR Section 6
2. Ultra Vires
   1. Simple Ultra Vires
   2. Extended Ultra Vires
3. Impropriety
   1. s 5(1)(e) ADJR --> Provides for improper exercise of authority as grounds for review
      1. Use of Relevant / Irrelevant Considerations - ss 5(2)(a)(b)
         1. s 5(2)(a): 'taking an irrelevant consideration into account in the exercise of power'
            1. Error of law
            2. Water Conservation Commission v Browning
            3. Padfield v MAFF
            4. Murphyores
            5. Irrelevant use of Policy
            6. Roberts v Hopwood
            7. Bowser v Randwick
         2. s 5(2)(b) 'taking a relevant consideration into account in the exercise of authority'
      2. Improper Purpose - ss 5(2)(c)(d)
         1. s 5(2)(c) 'an exercise of power for a purpose other than a purpose for which the power is conferred'
         2. s 5(2)(d) 'an exercise of discretionary power in bad faith'
         3. Proper Purpose & Good Faith: 'Mixed Purpose'
         4. Multiple statutory purposes
         5. Evidentary burden on those asserting improper purpose
      3. Wrong Decision Maker - s 5(2)(e)
      4. Fetter of Discretion - s 5(2)(f)