What is the test for a finding of fact at an administrative tribunal to be patently unreasonable?

The courts have very strictly defined the conditions under which a finding of fact will be treated as patently unreasonable. Even when a superior court considers that the factual findings of an administrative tribunal are based on insufficient evidence, it should not intervene to revise the tribunal’s decision. Findings of fact subject to the patent unreasonableness standard may only be revised if they are not based on any evidence. As my colleague Snider J. wrote in a case also involving a complaint of unjust dismissal (Jennings v. Shaw Cablesystems Ltd., 2003 FC 1206):