Constituent assembly or "con-ass" is one of the three modes in which the 1987 Constitution of the Philippines could be amended or revised. The other two modes are via People's Initiative and Constitutional Convention. The bicameralPhilippine Congress (Senate and the House of Representatives) is in a Constituent assembly mode when they formally convene to propose amendments or revisions to the 1987 constitution; and under Article XVII of the Constitution of the Philippines, upon a vote of three-fourths of all its Members.
Charter change under Arroyo
The process of amending or revising the 1987 constitution of the Philippines is recently known to many Filipinos as Charter Change. The anti-charter change forces threatened to protest against political processes that could lead to a plebiscite on the charter change issue.
Charter change in the Philippines is a very controversial event, for the last time the constitution was appended, it led to the prolonging of the term of President Marcos and eventually, Martial Law.