Even though it says in the mishna that a court is made up of three judges, exceptions are made. An expert can judge on one’s own. Rabbi Abahu and Shmuel debate if 2 judges ruled in a case, would their judgment be effective? in what cases does a judge who makes a mistake, need to pay out of pocket to fix the mistake? When mediation is done, how many people are needed to mediate? Is mediation looked upon as a favorable solution or not?