The 1973 Constitution of the Philippines established a parliamentary system of government, vesting legislative power in the National Assembly. A Prime Minister was elected as head of government and commander-in-chief, while a President served as head of state. The judicial power was vested in the Supreme Court. The Constitution also established independent bodies like the Civil Service Commission and Commission on Audit. It was drafted by a constitutional convention and ratified by citizen assemblies, going into effect in January 1973.