The article specifies two processes for amending the Constitution. The first method, which concerns individual amendments first approved by Congress and then ratified by states, is what you learned about in Schoolhouse Rock! But Article V also says that if two-thirds of states petition Congress, the federal government must declare a convention that can consider an unlimited number of amendments at once. As with the individual amendment process, three-fourths of the states would then be required to approve any changes before they could become official.