The document summarizes the history and implementation of primary health care (PHC) in the Philippines. It discusses the definition of PHC according to the WHO and how it was adopted in the Philippines. It then outlines the different periods of PHC implementation: pre-devolution, institutionalization, and devolution. Under each period, it describes the various approaches, innovations, and mechanisms used to promote PHC in the country. It concludes by noting some of the challenges faced in fully implementing PHC.