linguistic:voice_change, linguistic:translation
Overview

The precise extent of the rule varies from jurisdiction to jurisdiction. As a preliminary or threshold issue, the court may first determine if the agreement was in fact totally reduced to a written document or (in US terminology) fully "integrated". In the case of State Rail Authority of New South Wales v Heath Outdoor Pty Ltd McHugh J held that the parol evidence rule has 'no operation until it is first determined' that all the terms of the contract are in writing. This threshold question applies even in those jurisdictions that apply a very strong form of the parol evidence rule, called the " Four Corners Rule ".