What is the criteria for certification of a class A class B class B claim?

Ontario, Canada

The following excerpt is from Carillo v. Vinen Atlantic S.A., 2014 ONSC 5269 (CanLII):

The third criterion for certification is the common issues criterion. For an issue to be a common issue, it must be a substantial ingredient of each Class Member's claim and its resolution must be necessary to the resolution of each Class Member's claim: Hollick v. Toronto (City), supra at para. 18.

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