The Wilopo Cabinet was something of a watershed in post-revolutionary Indonesian politics. During its 14 months of existence important changes developed in the constellation of political power among the major political parties, the President, and the army. And within one of the major parties there occurred a shift in the relative strength of leadership groups of such importance as to bring about significant changes in the party's political posture and in its relationship with several of the other parties. It was during this period that cabinet government was seriously undermined and parliament lost much of its prestige and power; and it was during these 14 months that were set in train many of the developments which have dominated Indonesian political life in the last few years. Reissue of a 1958 Cornell Southeast Asia Programme study.