Decision-Making in the Public Sector: The Electoral Reform in Taiwan“Single-member Constituency Two ballots System” and “Cutting the Legislative Seats in Half” Case Study 黃國敏 Public Administration Humanities and Social Sciences edhwang@chu.edu.tw Abstract Decision-making is the study of identifying and choosing alternatives based on the values and preferences of the decision maker. Decision making is also the process of sufficiently reducing uncertainty and doubt about alternatives to allow a reasonable choice to be made from among them. The research methods in this study include naturalistic (unobtrusive) and recording observation and case study. On August 23, 2004, the Legislative Yuan in Taiwan passed landmark constitutional amendment proposals to cut the number of legislative seats from 225 to 113, extend terms to four years from three, adopt a "single-member constituency two-ballot" system, ensure women half of the seats for legislators from the nationwide constituency, give people referendum rights, and abolish the National Assembly. They signify the district legislators shall be elected as the number of districts; nationwide constituency and overseas legislators shall be elected according to the list of nomination of the parties that has garnered more than 5% of the votes, Female legislators shall account for no less than one half of the elected members of each party. Comparing the decisionmaking theories and the Taiwanese electoral reform case study shows that the governmental politics model (bureaucratic politics model or political decision model) explains most the legislature’s arena. Power is matter, and the most decisions in Congress are made based on partisan struggle rather than rationality. Keyword:decision-making, electoral reform, Taiwan, governmental politics model, political decision model