This article analyzes five electoral reforms that were enacted in Chile between 1958 and 1962. These reforms introduced the Australian Ballot, and also changing the rules about electoral pacts. By using an analytical frame based on recent literature, the article focuses on the “who and why” of these reforms, chiefly which incentives did the political parties have in order to pursue these legal changes, and the objectives they tried to achieve through them. To analyze the aforementioned, the research concentrates on the political context of the reforms, their political and parliamentary discussion. The paper argues that these five reforms are related to two main objectives: the intention to improve and/or hurt the political interests of specific actors, and to overcome legitimacy problems of the party system.