G. RELEVANT PRINCIPLES
54 An administrative decision maker is required to engage in what has been described by the Full Court of this Court in a number of recent cases as "an active intellectual process" with the "relevant matters or criteria": Tickner v Chapman (1995) 57 FCR 451, 462 (Black CJ), 476-477 (Burchett J), 495-496 (Kiefel J, as her Honour then was); Carrascalao v Minister for Immigration and Border Protection (2017) 252 FCR 352; [2017] FCAFC 107 at [35], [46] (Griffiths, White and Bromwich JJ); CAR15 v Minister for Immigration and Border Protection (2019) 272 FCR 131; [2019] FCAFC 155 at [76] (Allsop CJ, Kenny and Snaden JJ). In this regard, findings require a probative basis and "some intellectual engagement that is beyond stereotyping and speculation": DQM18 v Minister for Home Affairs (2020) 278 FCR 529; [2020] FCAFC 110 at [53] (Bromberg, Mortimer and Snaden JJ).
55 As the High Court, however, explained in Plaintiff M1/2021 v Minister for Home Affairs [2022] HCA 17 at [26] (Kiefel CJ, Keane, Gordon and Steward JJ), in scrutinising the decisions of decision makers, it is necessary for the Court to recognise that:
Labels like "active intellectual process" and "proper, genuine and realistic consideration" must be understood in their proper context. These formulas have the danger of creating "a kind of general warrant, invoking language of indefinite and subjective application, in which the procedural and substantive merits of any [decision maker's] decision can be scrutinised". That is not the correct approach. As Mason J stated in Minister for Aboriginal Affairs v Peko-Wallsend Ltd, "[t]he limited role of a court reviewing the exercise of an administrative discretion must constantly be borne in mind". The court does not substitute its decision for that of an administrative decision-maker.
(Citations omitted.)
56 In M1, their Honours Kiefel CJ, Keane, Gordon and Steward JJ, relevantly, also stated the following in respect of the requisite level of engagement required by an administrative decision maker:
24 Consistently with well-established authority in different statutory contexts, there can be no doubt that a decision-maker must read, identify, understand and evaluate the representations. Adopting and adapting what Kiefel J (as her Honour then was) said in Tickner v Chapman, the decision-maker must have regard to what is said in the representations, bring their mind to bear upon the facts stated in them and the arguments or opinions put forward, and appreciate who is making them. From that point, the decision-maker might sift them, attributing whatever weight or persuasive quality is thought appropriate. The weight to be afforded to the representations is a matter for the decision-maker. And the decision-maker is not obliged "to make actual findings of fact as an adjudication of all material claims" made by a former visa holder.
25 It is also well-established that the requisite level of engagement by the decision-maker with the representations must occur within the bounds of rationality and reasonableness. What is necessary to comply with the statutory requirement for a valid exercise of power will necessarily depend on the nature, form and content of the representations. The requisite level of engagement - the degree of effort needed by the decision-maker - will vary, among other things, according to the length, clarity and degree of relevance of the representations. The decision-maker is not required to consider claims that are not clearly articulated or which do not clearly arise on the materials before them.
(Citations omitted.)
57 Reasons for an administrative decision that are illogical, irrational, or legally unreasonable may give rise to jurisdictional error. Illogicality, irrationality and unreasonableness do not solely arise in respect of a decision maker's ultimate conclusion or decision. Each may also arise in respect of findings or reasoning leading to the ultimate conclusion or decision, albeit that the overarching question is whether the decision is affected by jurisdictional error: Minister for Immigration and Citizenship v SZMDS (2010) 240 CLR 611; [2010] HCA 16 at [132] (Crennan and Bell JJ); see also Minister for Immigration and Citizenship v SZRKT (2013) 212 FCR 99; [2013] FCA 317 at [150]-[156] (Robertson J); ARG15 v Minister for Immigration and Border Protection (2016) 250 FCR 109; [2016] FCAFC 174 at [47] (Griffiths, Perry and Bromwich JJ); CGA15 at [58]-[61]; King v Minister for Immigration, Citizenship, Migrant Services and Multicultural Affairs [2023] FCAFC 152 at [52] (Anderson, Feutrill and Raper JJ)
58 The Court's role in reviewing an administrative decision for legal unreasonableness is "strictly supervisory" and is an exercise concerned with determining whether there has been a lawful exercise of power having regard to the terms, scope and purpose of the relevant statutory power Minister for Immigration and Border Protection v Stretton (2016) 237 FCR 1; [2016] FCAFC 11 at [92] (Wigney J); Minister for Immigration and Border Protection v Eden (2016) 240 FCR 158; [2016] FCAFC 28 at [65] (Allsop CJ, Griffiths and Wigney JJ); King at [53]. It would not be the correct approach for the Court to reach its own view of what is reasonable or not, and to supplant the view of the Minister. Rather, the question, ultimately, is whether the conclusion is one upon which reasonable minds can differ about the outcome of, or justification for, the exercise of power, or where the outcome falls within the range of legally and factually justifiable outcomes, and if the answer to these questions is yes, the exercise of power will not be legally unreasonable: Stretton at [21] (Allsop CJ), [92] (Wigney J).
59 Further, the existence of error is not sufficient to establish jurisdictional error. It is also necessary to establish materiality. An error is only material if there is a realistic possibility that the decision in fact made could have been different had the error not occurred: Minister for Immigration and Border Protection v SZMTA (2019) 264 CLR 421; [2019] HCA 3 at [45] (Bell, Gageler and Keane JJ); CRL18 v Minister for Immigration, Citizenship, Migrant Services and Multicultural Affairs [2020] FCA 917 at [71], [83] (Stewart J). A majority of the High Court recently declined to revisit the explanation of materiality in SZMTA, describing it as "sound in principle and consistent with precedent": MZAPC v Minister for Immigration and Border Protection (2021) 273 CLR 506; [2021] HCA 17 at [2]-[3] (Kiefel CJ, Gageler, Keane and Gleeson JJ).