What is the evidentiary standard on a certification motion?

Canada (Federal), Canada

The following excerpt is from Merlo v. Canada, 2017 FC 51 (CanLII):

The evidentiary standard on a certification motion is low. In fact, in the settlement context, such as here, courts have generally engaged in a less vigorous analysis of the certification criteria (see Gariepy v. Shell Oil Co., [2002] OJ No 4022 at para 27).

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