What is the test for common issue in a class action?

Ontario, Canada

The following excerpt is from Trustees of the Millwright Regional Council of Ontario Pension Trust Fund v. Celestica Inc., 2014 ONSC 1057 (CanLII):

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 paragraph 18.

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