The principle of functus officio provides that once a decision-maker has done everything necessary to perfect his or her decision, he or she is then barred from revisiting that decision, other than to correct clerical or other minor errors. The policy rationale underlying this doctrine is the need for finality in proceedings: Chandler v. Alberta Association of Architects, 1989 CanLII 41 (SCC),  2 S.C.R. 848, at paras. 20-21,  S.C.J. No. 102.
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