What is the standard of review on a finding of fact?

It is settled law that the standard of review on a question of law is correctness. The standard of review on findings of fact is "palpable and overriding error". The application of a legal standard to a set of facts is a question of mixed fact and law, and thus subject to a standard of palpable and overriding error, unless it is clear that the trial judge made some error in principle with respect to the characterization of the standard or its application, in which case the error may amount to an error in law, subject to the standard of correctness: Housen v. Nickolaison, 2002 SCC 33, [2002] 2 SCR 235 at 237-238.