[3] A Regional Assembly was created form ARMM as part of Republic Act No.

6734,[4] otherwise known as the Organic Act for the Autonomous Region in Muslim Mindanao, with the scope and limitations of the Assembly is defined in the Article VII.

The 1st ARMM Regional Assembly was elected on February 12, 1990, to serve a three-year term, starting June 30, 1990.

The current membership is 24, where 6 are from Lanao del Sur including Marawi City, 6 from Maguindanao, 6 from Sulu, 3 from Basilan and 3 from Tawi-Tawi.

The Assembly exercises legislative power in the autonomous region, except on the following matters: foreign affairs, national defense and security, postal service, coinage and fiscal and monetary policies, administration of justice, quarantine, customs and tariff, citizenship, naturalization, immigration and deportation, general auditing, national elections, maritime, land and air transportation, communications, patents, trademarks, trade names and copyrights, foreign trade.