Final answer:
Key personnel in a civil trial include parties and legal practitioners, such as lawyers and attorneys.
Step-by-step explanation:
In a civil trial, key personnel include parties and legal practitioners. The parties involved in a civil trial are the plaintiff and the defendant. The plaintiff is the party who brings a complaint or accusation against another party, while the defendant is the party accused of causing harm. Legal practitioners, such as lawyers and attorneys, represent the parties and are responsible for presenting their case and advocating for their clients' interests.