If someone brings a plaintiff on you, you must attend a court case against that person. You will attend that case as a defendant and be told the complaint, which is the reason you are summoned. This is then put in as a pleadings, which is the formal reason for the case. Then, you will meet the other party and talk with them, this is called a pretrial conference. You will then have a mediation, in which the case may be ended. If the case is not ended then, you have an arbitration, which is when a third party reviews the case and imposes their decision. If the case is not decided by then you go to trial. The trial is mainly decided by the preponderance of evidence, which lets the judge decide which side the evidence supports better. The verdict is then decided by the jury, and the person being tried may appeal and be tried again by a higher court.