“Res Judicata” — A form of estoppel, this doctrine provides judicial finality.
Cause of action estoppel prevents a party from relitigating a claim that was decided or could have been raised in an earlier proceeding. Issue estoppel is narrower than cause of action estoppel.
Res judicata prevents a party from relitigating an issue already decided in an earlier proceeding, even if the causes of action in the two proceedings differ.
Minott v. O’Shanter Development Company Ltd., 1999 CanLII 3686 (ON CA)
Angle v. M.N.R., 1974 CanLII 168 (SCC),  2 SCR 248