Final answer:
The two major phases in the amendment process are proposing an amendment and ratifying an amendment.
Step-by-step explanation:
The two major phases in the amendment process are proposing an amendment and ratifying an amendment. To propose an amendment, it must be officially proposed by a two-thirds vote in both houses of Congress or by two-thirds of all state legislatures. To ratify an amendment, three-fourths of the state legislatures must agree to adopt it.