60 A classic statement of the distinction between the two categories of compromise agreement is to be found in British Russian Gazette & Trade Outlook Ltd v Associated Newspapers Ltd [1933] 2 KB 616, 644 (Scrutton LJ). In the vernacular applied to agreements of compromise, the deed of release, and the agreement which it effected, is an 'accord and satisfaction', rather than an 'accord executory'. The distinction between the two is that in the former category of agreement, the agreement extinguishes the previous cause of action, and replaces it with a cause of action arising from the promise received in return for the release. However, in the case of an 'accord executory', the cause of action is not extinguished until the promise of the recipient of the release has been performed: see McDermott v Black [1940] HCA 4; (1940) 63 CLR 161, 184 185 (Dixon J). In Osborn v McDermott (1998) 3 VR 1, it is suggested that there are two classes of compromise which do not extinguish the original cause of action - the accord executory, which does not constitute a contract and is unenforceable, and an accord and conditional satisfaction, which gives rise to an enforceable contract, but does not extinguish the original cause of action until performed (10 11): see also National Australian Bank v Pollak [2001] FCA 1408 [26] (Madgwick J). That distinction is not material to this case as the deed of release is clearly expressed as an unconditional accord and satisfaction. As Dixon J points out in McDermott v Black, historically there have been differences between courts of common law and courts of equity as to the procedures adopted with respect to the pleading of agreements of compromise (186 188), but since common law and equity have long been fused in Western Australia, those historical distinctions are of no continuing relevance.