Was the decision "based on" the existence of such facts?
16 Section 476(1) provides for the grounds for review of the Immigration Review Tribunal or Refugee Review Tribunal. These include:
"(g) that there was no evidence or other material to justify the making of the decision."
Section 476(4) relevantly provides:
"(4) The ground specified in paragraph (1)(g) is not to be taken to have been made out unless:
(a) …
(b) the person who made the decision based the decision on the existence of a particular fact, and that fact did not exist."
17 These provisions are in identical terms to s 5(1)(h) and s 5(3)(b) of the Administrative Decisions (Judicial Review) Act 1977 (Cth).
18 A literal reading of s 476(4)(b) might suggest that where a decision-maker treated two or more facts as material to the decision, then the decision was "based on" all of such facts, in the sense that each fact formed part of the total material which supported the decision.
19 The history of the corresponding provisions of the AD(JR) Act shows that they were intended to be more restrictive of judicial review than the common law. In Television Capricornia Pty Ltd v Australian Broadcasting Tribunal (1987) 13 FCR 511 at 519-520 Wilcox J traces this history. His Honour points out that a deliberate decision was made that it would not be sufficient to show the decision was based upon the assumption of a particular fact of which the decision-maker had no evidence, as in R v Deputy Industrial Injuries Commissioner; Ex parte Moore [1965] 1 QB 456 at 458 and Mahon v Air New Zealand Ltd [1984] AC 808 at 821. Rather, the applicant had to negative the fact. Wilcox J pointed out (at 520) that this "may constitute a heavy burden, especially where the facts are obscure".
20 But to return to the rather different question touched on above, when is a decision "based on" a particular fact? Does s 476(4)(b) assume that there may be facts relevant to a decision, but some may be more important than others, so that the decision is only "based on" facts of the former kind? If so, what are the criteria for ascertaining this superior degree of importance (or relevance)?
21 In discussing the corresponding provisions in the AD(JR) Act Mason CJ (with whom Brennan and Deane JJ agreed) referred to those provisions as requiring proof of the non-existence of a fact "critical to the making of the decision": Australian Broadcasting Tribunal v Bond (1990) 170 CLR 321 at 358. However s 5(3)(h) of the AD(JR) Act was not in issue in Bond and the provision is not the subject of any further discussion by their Honours. What content can be given to this synonym "critical"?
22 As often happens in the law, courts have turned to metaphor as a means of giving shape to the concepts conveyed by the language of statute. Professor Jeremy Webber notes in his article "Constitutional Poetry; The Tension between Symbolic and Functional Aims in Constitutional Reform" (1999) 21 Sydney Law Review 260 at 271:
"Metaphor and analogy are basic building blocks of our political or legal arguments. When we define our concepts, we often do so by refining our metaphorical arsenal."
23 The leading Full Court authority on s 5(3)(h) of the AD(JR) Act is Curragh Queensland Mining Limited v Daniel (1992) 34 FCR 212. In that case Black CJ, with whom Spender and Gummow JJ agreed, said (at 220):
"Section 5(3)(b) does not require the identification of some single particular fact that may be said to be the foundation of the decision. The decision may be based upon the existence of many particular facts; it will be based upon the existence of each particular fact that is critical to the making of the decision. A small factual link in a chain of reasoning, if it is truly a link in a chain and there are no parallel links, may be just as critical to the decision, and just as much a fact upon which the decision is based, as a fact that is of more obvious immediate importance. A decision may also be based on a finding of fact that, critically, leads the decision-maker to take one path in the process of reasoning rather than another and so to come to a different conclusion.
If a decision is in truth based, in the sense I have described, on a particular fact for which there is no evidence, and the fact does not exist, the decision is flawed whatever the relative importance of the fact. Accordingly, I agree with the conclusion of Lee J in Akers v Minister for Immigration and Ethnic Affairs (1988) 20 FCR 363 at 374 that there is no reason to read s 5(3)(b) in a way that would limit its application to a predominant reason for the decision under review." [Emphasis added]
His Honour then discussed the evidence in the case and concluded (at 221):
"The process of reasoning having properly and clearly been revealed by the decision-maker, it can be seen that the finding of a particular fact was critical to the decision because it fundamentally affected the course of reasoning leading to that decision. The finding shut off a path that could have led to a decision in Curragh's favour." [Emphasis added]
24 Likewise in the present case counsel for the applicant spoke of factual "links" and findings which led the decision-maker to "take one path".
25 Even if, contrary to the view I have reached, the discrepancy between the applicant's account of the shooting and other accounts and the non-occurrence of political violence in Sri Lanka outside election times were "facts" which did not exist, the Tribunal's decision was plainly in my view not "based" on the existence of those facts, or either of them.
26 In the circumstances of the present case the appropriate metaphor is not the chain or the fork in the road, but rather the net. A net does not necessary fail because one or more of its constituent strands fail. It all depends on how strong the remaining strands are and the size or mass or power of the object which the net is being used to restrain or support. There were a number of other strands, unchallengeable in a review of this nature, which supported the Tribunal's conclusion. The Tribunal, which heard the applicant in person and engaged in dialogue with him, simply did not accept him as a truthful person. Moreover there was unarguable circumstantial evidence, and in particular his staying in Sri Lanka and waiting for low season airfares, which weighed heavily against the acceptance of his case.
27 As a matter of rational decision making, the decision was well supported by facts quite separately from the allegedly non-existent facts.