There are three layers of authority in the federal court system:
- The Supreme Court is the highest federal court in the country. 
- The twelve Courts of Appeals and the Court of Appeals for the Federal
                    Circuit have moderate jurisdiction. 
- Several district and specialized courts have the most restricted
                    jurisdiction in the federal court system. 
The Structure of the Federal Courts 
The Supreme Court 
The Supreme Court is the highest court in the land. Sometimes it hears
                    cases as a trial court, but most of the time the Court functions as an appellate
                    court. The Court has traditionally consisted of nine justices: one chief justice
                    and eight associate justices. Although Congress has the power to change the
                    number of justices, the number has held steady at nine justices since 1869.
                    Supreme Court justices serve for life.
Selecting Cases 
The Supreme Court receives thousands of appeals every year but hears
                        only a small percentage of them. The Court meets in closed session to decide
                        which cases to hear. The Court generally follows the rule of
                            four in choosing cases: If four justices want to hear a case, the
                        Court will accept it. When the Court decides to hear a case, it issues a
                            writ of certiorari, a legal document ordering a lower court
                        to send a case to the Supreme Court for review. The writ of certiorari
                        signals that the Supreme Court will hear the case. The Court tends to hear
                        only cases of great importance, such as cases involving a constitutional
                        matter or a possible overturning of precedent. 
The Court is more likely to grant a writ of certiorari if one of the
                        appellants is the U.S. government. The solicitor general, a high-ranking
                        official in the Justice Department, submits the requests for certiorari and
                        argues cases in front of the Court as the lawyer for the federal
                        government.
Briefs and Oral Arguments 
Both parties in a case must submit briefs to the Court,
                        documents that present the party’s position and argument. Sometimes, other
                        groups submit amicus curiae briefs (friend of the court
                        briefs), which present further arguments in favor of one party or the other.
                        The justices read the briefs and then may hear oral arguments,
                        in which both parties have thirty minutes to make their case before
                        the full Court. During oral arguments, the justices frequently interrupt the
                        attorneys to ask questions. 
Deciding Cases 
After oral arguments, the justices meet in judicial
                            conference to discuss the case. Sometimes the Court issues a
                            per curiam rejection, an unsigned decision that reaffirms
                        lower court’s ruling. This rejection means that the Supreme Court has
                        decided not to hear the case. Only the justices and their clerks attend the
                        conference, and the proceedings are kept secret. After debating the case,
                        the justices vote. The Court then issues a decision, which
                        states the Court’s ruling, and an opinion, which explains the
                        Court’s legal reasoning behind its decision.