This was an appeal from the Federal Court of Appeal. The issue was whether a party may call expert evidence when the Court has appointed assessors. At trial, the trial Judge applied a well established rule of admiralty and, pursuant to that rule, she refused to disclose to the parties the questions put to assessors and refused the parties the right to call their own expert evidence. On appeal, the Court of Appeal held that the admiralty rule prohibiting expert evidence was restricted to situations where the issues the assessors were seamen appointed to deal with were issues of navigation and seamanship. The Court of Appeal nevertheless refused the appeal as there had been no prejudice to the Appellant. On further appeal to the Supreme Court of Canada, the Supreme Court allowed the appeal and ordered that there be a new trial. The Supreme Court of Canada held that there was a strong argument that procedural matters, such as the admiralty rule prohibiting expert evidence, were not incorporated into Canadian Maritime Law by s. 42 of the Federal Court Act. Section 42 of the Federal Court Act, and its predecessor provisions, incorporate only the substantive aspects of admiralty law as administered by the High Court of England on its Admiralty side. Further, the Court held that even if the rule against expert evidence was incorporated as part of Canadian Maritime Law it was not immutable. "The Courts may change common law rules where this is necessary to achieve justice and fairness by bringing the law into harmony with social, moral and economic changes in society, and where the change will not have complex and unforeseeable consequences". Such changes are more readily made where the rules are procedural rather than substantive. Applying this test the Court found the rule against expert evidence required modification as it violated the parties right to be heard and was out of step with modern trial practice. The Court therefore modified the rule to permit assessors to give the Judge assistance on technical matters and even to give advice on matters of fact but, such advice is to be disclosed to the parties who are to have a right of response. Further, in all cases, the parties are at liberty to call their own expert evidence.