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. Comparing the decision-making theories and the Taiwanese work-hours case study shows that the governmental politics model (or bureaucratic politics model by Wiarda) explains most the legislature's arena. Power is matter, and the most decisions in Congress are made based on partisan struggle rather than rationality.