The Constitution provides that an amendment may be proposed either by the Congress with a two-thirds majority vote in both the House of Representatives and the Senate or by a constitutional convention called for by two-thirds of the State legislatures.
Well, the amendment process is a way to add a proposed constitutional amendment to the states. This process is very secure and proven to work, so it concomitantly ensures the growth of the constitution.
The writers of the constitution wanted a new plan of government because they felt the old plan gave too much power to the states and allowed too much democracy. They fixed these problems in the document that we now call the Constitution
