There must be a material change of circumstances. A material change of circumstances is the change which, if known at the time of the order, would likely have resulted in different terms. However, if the matter relied upon as constituting the change was known at the relevant time, it cannot be relied upon as a basis for variation: Willick v. Willick, 1994 CanLII 28 (SCC), [1994] 3 S.C.R. 670 at para. 21.
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