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The United States Constitution can be changed informally. Informal amendments mean that the Constitution does not specifically list these processes as forms of amending the Constitution, but because of change in society or judicial review changed the rule of law de facto.
Article Five gives two ways to amend, or change, the Constitution. 1  Congress can write a change, if two-thirds of the members in each House agree. 2  The state governments can call a convention to write changes, although this has not happened since 1787.