Philippine Society and Revolution (translated in Filipino as Lipunan at Rebolusyong Pilipino), first published in 1971, is a book written by Filipino Maoist revolutionary and founder of the Communist Party of the Philippines Jose Maria Sison, under his nom de guerre Amado Guerrero. Regarded as one of the CPP's principal references, PSR has also influenced the Filipino mass movement since its first publication. It applied Maoist analysis to contemporary Filipino society, describing its class structure, its basic problems, and the "class logic of the revolutionary solution — which is the people's democratic revolution.": 12  The book was first written in the aftermath of the First Quarter Storm in 1970 and the reestablishment of the Communist Party of the Philippines in 1968. It first appeared in The Philippine Collegian under the title Philippine Crisis and Revolution. In it, Guerrero applied Marxist class analysis to Filipino society, and described Philippine history from a historical materialist lens. Guerrero then summarized the "basic problems of the Filipino people" as US imperialism, feudalism, and bureaucrat capitalism. In the last part, Guerrero advocates for a stage of people's democratic revolution with a socialist perspective. The national democratic mass movement takes its cues from the thesis laid out by Guerrero in Philippine Society and Revolution. The Communist Party of the Philippines cites PSR, alongside Guerrero's other documents, Specific Characteristics of our People's War and Our Urgent Tasks as guides in "laying down the basic principles of the two-stage revolution in the Philippines based on the analysis of concrete conditions of the semi-colonial and semi-feudal system." Source: Wikipedia (en)