Ground 3: Alleged unreasonableness, illogicality or irrationality
40 Ground 3 alleges that there were three respects (described by the applicant as strands of reasoning) in which the Tribunal adopted a mode of reasoning as to the facts that was unreasonable, illogical or irrational.
41 In Vo v Minister for Home Affairs [2019] FCAFC 108; (2019) 269 FCR 566, the applicable principles were summarised in the following terms at [43] (Derrington, Banks-Smith and Colvin JJ):
(1) the test for unreasonableness is stringent and extremely confined: Minister for Immigration and Border Protection v SZVFW [2018] HCA 30 at [11], [52], [135];
(2) where reasons have been provided then the reasons are the focal point for assessing whether the decision was unreasonable: Minister for Immigration and Border Protection v Singh [2014] FCAFC 1; (2014) 231 FCR 437 at [46]-[47];
(3) unreasonableness will not be demonstrated on the basis of a complaint about the weight given to particular evidence or material because determination of the weight to be given to evidence or material is a matter entrusted to the Tribunal: Tran v Minister for Immigration & Multicultural & Indigenous Affairs [2004] FCAFC 297 at [4]-[5];
(4) it is for the Tribunal to reach conclusions about credibility and unreasonableness is not shown by complaints about credibility findings alone, but may be demonstrated where a finding on credit on an objectively minor matter of fact is used as a basis for rejecting the entirety of the claimant's evidence (a conclusion to be reached with a high degree of caution): CQG15 v Minister for Immigration and Border Protection [2016] FCAFC 146; (2016) 253 FCR 496 at [40]-[45] and DAO16 v Minister for Immigration and Border Protection [2018] FCAFC 2; (2018) 258 FCR 175 at [30];
(5) generally speaking, the Tribunal has the authority to reach conclusions about the inferences that might be drawn from particular evidence or material;
(6) the Tribunal is not required to refer to every piece of evidence placed before it: ETA067 v The Republic of Nauru [2018] HCA 46 at [13];
(7) in many instances, by reason of the nature of the Tribunal's statutory obligation to give reasons, it may be inferred that a failure to refer to a particular matter reflects the Tribunal's view that it was not material to its decision: Minister for Immigration and Multicultural Affairs v Yusuf [2001] HCA 30; (2001) 206 CLR 323 at [5], [69] and Minister for Immigration and Border Protection v SZSRS [2014] FCAFC 16 at [34] (although the positon may be different where there is a failure to consider a factual issue that is an essential integer of a claim or that would be dispositive: Applicant WAEE v Minister for Immigration & Multicultural & Indigenous Affairs [2003] FCAFC 184; (2003) 236 FCR 593 at [47] and ETA067 at [14]);
(8) mere strong disagreement with factual reasoning does not establish jurisdictional error: Minister for Immigration and Multicultural Affairs v Eshetu [1999] HCA 21; (1999) 197 CLR 611 at [40];
(9) a decision (not just a part of a decision) which lacks an evident and intelligible justification is unreasonable: SZVFW at [10], [82];
(10) a decision that no reasonable person could have arrived at is one circumstance in which the decision may be unreasonable, but there may be others - the category is not limited to such instances: SZVFW at [10], [59], [82], [89], [133]; and
(11) there must be an error that is so grave both as to its nature and the significance of its subject matter that it results in a decision that has been reasoned in a manner that it is not authorised: Hossain at [25], [30]-[31].
42 In addition, it is important to bear in mind the following aspect of the inquiry as described by Allsop CJ (Wigney J agreeing) in Minister for Immigration and Border Protection v Stretton [2016] FCAFC 11; (2016) 237 FCR 1 at [12]:
Crucial to remember, however, is that the task for the Court is not to assess what it thinks is reasonable and thereby conclude (as if in an appeal concerning breach of duty of care) that any other view displays error; rather, the task is to evaluate the quality of the decision, by reference to the statutory source of the power and thus, from its scope, purpose and objects to assess whether it is lawful. The undertaking of that task may see the decision characterised as legally unreasonable whether because of specific identifiable jurisdictional error, or the conclusion or outcome reached, or the reasoning process utilised.
43 Finally, as I stated on the leave application in the present matter at [34]:
As to unreasonableness, the review ground is not made out by demonstrating an error in factual reasoning. It requires an assessment of the overall character of the administrative decision and whether it conforms to the implied statutory standard of reasonableness. Therefore, either the overall result must be unreasonable or the reasons as a whole must fail to provide an intelligible justification for the result: Tsvetnenko v United States of America [2019] FCAFC 74; (2019) 269 FCR 225 at [82]-[85]. The same approach pertains to claims of alleged jurisdictional error characterised in terms of irrationality and illogicality: Minister for Immigration and Citizenship v SZMDS [2010] HCA 16; (2010) 240 CLR 611 at [119]; and BHD18 v Minister for Immigration, Citizenship, Migrant Services and Multicultural Affairs [2020] FCAFC 151 at [29].