The bilingual policy in education aims to develop a Filipino who is proficient in both English and Filipino. For the past 20 years, since the DECS adopted the bilingual policy, Tagalog-based Pilipino has been used to teach over half of the subjects in the elementary and secondary curriculum of both public and private schools. Mathematics and the natural sciences continue to be taught in English. Despite the findings of the Ateneo Social Weather Survey that 92% of Filipinos already speak and understand Tagalog, many provinces north and south of Metro Manila still encounter problems with the language. This is unfortunate because Pilipino is used in nationally conducted exams and tests. While the bilingual policy is a law which not even the Secretary of Education can change, it has become a growing concern that many students are deficient in communication skills.