What is the test for reasonableness in statutory interpretation?

I believe that it is important at this stage to re-emphasize that matters of statutory interpretation “are not treated uniquely” and may be evaluated on a reasonableness standard (Vavilov at para. 115). Where that standard applies to such a matter, as is the case here, our role, again, is not to undertake a de novo analysis of the question or to ask ourselves “what the correct decision would have been” (Vavilov at para. 116, quoting Law Society of New Brunswick v. Ryan, 2003 SCC 20, [2003] 1 S.C.R. 247 at para. 50). Our task, in a case such as this one, is to determine whether the interpretation that stems from the decision maker’s decision falls within a range of possible, acceptable outcomes.