Chaina v Presbyterian Church (NSW) Property Trust (No. 24)

The matter before the court involved the plaintiff, Chaina, who brought proceedings against the defendant, the Presbyterian Church (NSW) Property Trust, concerning issues related to the validity of certain evidence presented during the trial. The case was heard in the Supreme Court of New South Wales. The primary focus of the dispute was the admissibility and reliability of expert evidence provided by the plaintiff, which was contingent on certain assumptions and documents that were not presented in court or substantiated through other means.

The central legal issues the court needed to address were whether the expert evidence provided by the plaintiff was admissible and whether it could be relied upon given that the underlying assumptions were not proven and the supporting documents were not in evidence. Specifically, the court had to determine if the expert's opinion, which was based on assumptions and documents not presented in court, was sufficiently reliable to be considered by the tribunal of fact.

The court examined the expert evidence closely and found that the expert's opinion was based on assumptions that were not otherwise proven and documents that were not produced in evidence. The court held that the assumptions were critical to the expert's conclusions, and since they were not substantiated, the expert evidence could not be relied upon. Additionally, the absence of the supporting documents further undermined the reliability of the expert's opinion. Consequently, the court rejected the expert evidence as it did not meet the necessary standards of admissibility and reliability. The court's decision was grounded in the requirement that expert evidence must be based on a proper factual foundation to be considered by the court.