Most 'class proceedings' are governed in Ontario by the Class Proceedings Act, 1992 (CPA, 1992)[see below], and federally by the Federal Courts Rules under the Federal Court Act [s.334.1-334.39, see below]. In essence they are a means of 'access to justice' by large groups of atomized plaintiffs (typically consumers) who would not - individually - be financially able to advance litigation against one or several related defendants (typically corporate) due to an imbalance of bargaining power. Recently there have been 'reverse' class proceedings, with large groups of atomized defendants - for example, internet users alleged to have breached copyright.
In some cases the Rules of Civil Procedure [RCP 12.07-12.08] also allow for class representation separate from the CPA, 1992 (see Rules of Civil Procedure, below).