People’s Initiative (or "PI") is a common appellative in the Philippines that refers to either a mode for constitutional amendment provided by the 1987 Philippine Constitution or to the act of pushing an initiative (national or local) allowed by the Philippine Initiative and Referendum Act of 1987. The appellative also refers to the product of either of those initiatives.
The provision in the 1987 Constitution of the Philippines allowing for a "people's initiative" as one of the modes for constitutional amendment has been called the "people's initiative clause." The other modes allowed by the Constitution involve a Constituent Assembly (or "Con-Ass") or a Constitutional Convention (or "Con-Con"), both of which also allow a total revision of the charter.
The appellation (also known as "PI") also refers to the act—allowed by the law-given right of the Filipino people—of directly initiating statutes or calling for referenda on both the national and the local government level.
The process of amending the 1987 Constitution of the Philippines is popularly known to many Filipinos as Charter Change. Any proposed amendment or revision must be ratified by the majority of Filipinos in a plebiscite.
Article XVII, Section 2 of the Constitution states:
"Amendments to this Constitution may likewise be directly proposed by the people through initiative upon a petition of at least twelve per centum of the total number of registered voters, of which every legislative district must be represented by at least three per centum of the registered votes therein. No amendment under this section shall be authorized within five years following the ratification of this Constitution nor oftener than once every five years thereafter.