What is the test for improvident settlement?

Ontario, Canada

The following excerpt is from Hanna v. Polanski et al, 2012 ONSC 3229 (CanLII):

To make a determination if a settlement was improvident a court is to look at the information available at the time of the settlement, not at later events or with hindsight. Griti v. Kingston (City), [2010] O.J. No. 4022

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