The role of the judge and the nature of the trial process differ significantly between Common Law's adversarial system and Civil Law's inquisitorial system.

In Common Law, trials are typically adversarial: two opposing parties (prosecution/plaintiff vs. defence) present their arguments, evidence, and witnesses to a neutral judge (and often a jury). The judge acts as an impartial arbiter, ensuring fair play and adherence to legal procedures, while the parties bear the primary responsibility for uncovering and presenting evidence. This structure places a strong emphasis on oral argument and cross-examination. Conversely, Civil Law typically employs an inquisitorial system. Here, the judge takes a much more active role in investigating the case, questioning witnesses, and gathering evidence. The judge is not merely an umpire but an active participant in determining the facts and applying the law. Proceedings are often more focused on written submissions and reports, with oral arguments playing a less dominant role compared to Common Law trials. This distinction reflects a fundamental difference in how each system seeks to uncover the 'truth' and administer justice.