The Commonwealth Constitution also says that the States can agree to give any of their powers to the Commonwealth. This can be done by an amendment to the Constitution through a referendum. More commonly, if all the states agree, then all state and Commonwealth parliaments pass laws to allow the transfer. These "transfer" laws may have a "sunset clause". This is a part of the law that means the law is only in place for a certain time. After this, the original division of powers is put back.