What is the test for overturning a judge’s decision?

Canada (Federal), Canada

The following excerpt is from Ishfaq v. Canada (Citizenship and Immigration), 2008 FC 477 (CanLII):

I can overturn the judge’s decision only if I find it was unreasonable, in the sense that it falls outside the “range of possible, acceptable outcomes which are defensible in respect of the facts and law”: Dunsmuir v. New Brunswick, 2008 SCC 9, at para. 47. (a) The Residency Requirement

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