The Philippine legislative system has undergone a series of evolutions that reflected the sociopolitical conditions of the times and the level of political maturity of society.
When martial law was declared, the Constitutional Convention, by virtue of an Act of Congress in 1971, was in the process of drafting a new Constitution. The final draft was adopted by the Convention on November 29, 1972. This was ratified and proclaimed by President Marcos on January 17, 1973 amidst widespread protest and controversy. With the proclamation of a new Constitution, the presidential form of government was changed to a modified parliamentary form. Congress was abolished and was replaced by an elected unicameral National Assembly, known as Batasang Pambansa.
1986 EDSA RevolutionThe world-famed bloodless coup of February 22-25, 1986 ushered in a new political regime. President Corazon Aquino, backed by a coalition of forces from both ends of the political spectrum, forged a new government, triggering a chain of events that dramatically changed the political landscape of the country and signalled the rebirth of democracy. These political changes were: the abolition of the Batasang Pambansa following the proclamation of a new revolutionary government; the organization of a Constitutional Commission that drafted a new charter which, in turn, was ratified in February 1987; the rebirth of the old bicameral system; and the election of Members to the new Congress.
The new Congress has the biggest membership and is probably the most powerful among its predecessor legislatures. The Constitutional Commission (ConCom) clothed it with vast powers to perform a wider and more dynamic role. This fact is partly reflected in the Charter itself, which devotes 32 sections to the legislative department compared with only 23 for the executive and 16 for the judicial departments.
"not more than 250 Members, who are elected from legislative districts apportioned among the provinces, cities and the Metropolitan Manila area in accordance with the number of inhabitants, and on the basis of a uniform and progressive ratio and those, as provided by law, elected through a party-list system of registered national, regional and sectoral parties or organizations". [Sec. 5(1), Art. VI, 1987 Philippine Constitution]