菲律賓語
He became director of Commission on the Filipino Language (Filipino: "Komisyon sa Wikang Filipino") formerly Surian ng Wikang Pambansa during the year 1971 to 1999. Under his leadership, Pineda started socio-linguistic research to further widen the Filipino Language. Also one of this is about the orthographic reform in the Filipino Language. Under Pineda one major change is on language policy: a bilingual education in the year 1974; Filipino as national and primary language of Filipinos in 1983 and the Filipino alphabet comprising 28 letters in 1987. He established 12 regional centers of the Filipino language throughout the Philippines.