 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.The Congress shall provide for the implementation of the exercise of this right.An enabling law for this Article XVII, Section 2 Philippine Constitutional provision, called the Initiative and Referendum Act, was authored in 1987 by senators Raul Roco (Aksyon Demokratiko) and Neptali Gonzales (Liberal Party) and was passed by the Eighth Congress of the Philippines in 1989.