What is the test for variation in terms of a child protection order?

The evidence at trial focused almost exclusively on the conduct of the parties which brings into question, as above, “the ability of the parents to meet the needs of the child”, and, accordingly, the statement by Sopinka J. in Willick v. Willick [1994] 3 S.C.. 670, (S.C.C.), at p. 688 is appropriate: “In deciding whether the conditions for variation exist, it is common ground that the change must be a material change of circumstances. This means a change, such that, if known at the time, would likely have resulted in different terms. The corollary to this is that if the matter which is relied on as constituting a change was known at the relevant time it cannot be relied on as the basis for variations.”