Which case highlights the importance of not allowing amendments that introduce new claims during a trial?

The case of AON Risk Services v ANU is significant in illustrating the boundaries within which amendments to claims can be made during a trial. In this case, the High Court addressed the implications of allowing amendments that introduce new claims at a late stage in the litigation process.

The Court emphasized that such amendments could disrupt the trial process, which is designed to address the issues that have been framed by the pleadings. Allowing new claims mid-trial can not only create prejudice against the opposing party but can also lead to inefficiencies by introducing unforeseen complexities and delaying the proceedings.

The judgment underscores the principle that the process must ensure fairness to both parties involved and maintain the integrity of the judicial system. This case serves as an important precedent, warning against the introduction of new claims or issues at the trial stage without careful consideration of the potential consequences, thus reinforcing the stability and predictability of legal proceedings.