The previous order is to be presumed to have been correct, is not to be departed from lightly and is only to be varied if the requirements of section 17 are satisfied. The change required must be a material change, one which if known at the time of the making of the last order would likely have resulted in a different order: Willick v. Willick (1994), 1994 CanLII 28 (SCC), 6 R.F.L. (4th) 161 (S.C.C.).
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