The chief superior judge assigns a presiding judge to each unit of the Vermont Superior Court. The presiding judge for each county unit determines the allocation of judicial resources between Civil, Criminal, and Family Divisions within the unit and may specially assign a superior judge within a division of the unit to preside over one or more cases in a different division. Judicial assignments are for a specific length of time, usually one year. They are subject to the approval of the Supreme Court. Depending on the size of a unit, individual judges may sit in specific divisions. In smaller units the same judge may sit in all divisions. The Environmental Division has statewide jurisdiction. The Judicial Bureau also has statewide jurisdiction.