The bailiff maintains order in the court and supervises the jury, if there is one. The other major figures in a trial are the plaintiff and defendant and their attorneys. Attorneys are officers of the court. Therefore, they are expected to know and follow all court rules. Their role is to protect the rights of their client.
Attorneys offer evidence and arguments to help the judge and the jury make a fair decision.
The judge oversees the trial and decides legal questions that arise. Cases tried in court are decided by either a judge or a jury. In most criminal cases and civil cases, either party may request a jury trial. To ensure fair and consistent proceedings, all trials are conducted according to established rules of procedure and evidence. Arizona Supreme Court.