What is the test for an unreasonable decision?

Canada (Federal), Canada

The following excerpt is from Tse v. Federal Express Canada Ltd., 2005 FC 599 (CanLII):

An unreasonable decision is one that is not supported by any reasons that can bear a somewhat probing examination. A decision will be unreasonable "only if there is no line of analysis within the given reasons that could reasonably lead the tribunal from the evidence before it to the conclusion at which it arrived". A decision may satisfy this standard of review if supported by a tenable explanation, even if that explanation is not one that a reviewing court finds compelling. See: Law Society of New Brunswick v. Ryan, 2003 SCC 20 (CanLII), [2003] 1 S.C.R. 247 at paragraph 55.

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