 6734 otherwise known as the Organic Act in pursuance with a constitutional mandate to provide for an autonomous area in Muslim Mindanao.A plebiscite was held in the provinces of Basilan, Cotabato, Davao del Sur, Lanao del Norte, Lanao del Sur, Maguindanao, Palawan, South Cotabato, Sultan Kudarat, Sulu, Tawi-Tawi, Zamboanga del Norte and Zamboanga del Sur; and in the cities of Cotabato, Dapitan, Dipolog, General Santos, Iligan, Marawi, Pagadian, Puerto Princesa and Zamboanga to determine if the residents would want to be part of the ARMM.Of the areas where the plebiscites were held only Lanao del Sur, Maguindanao, Sulu and Tawi-Tawi voted favorably for inclusion in the new autonomous region.