This paper investigates decision-making under uncertainty and complexity. The focus point of the study was to investigate how organizations in Stockholm has come to a decisions on how to manage the trial implementation of a congestion tax in terms of their company cars. The study was conducted as a survey with complementary interviews with the decision makers in change of congestion tax problem. The aim of the study was to gain an understanding for the decision making processes, and how and why the companies decided as they did. The theory on which we based our study emanated from both systems theory and business economic theory on decision making. The latter involving both normative and descriptive theory. This gave us the means to understand and analyse our empirical work. The study shows that decision makers in organizations often act irrational and on quite loose grounds, without any financial inquiry when coming to a decision on complex matters. We have found that decision makers stride from the path of what normative decision making theory suggest on how to structure and solve a problem. As the complexity of the problem at hand rises, decision makers turn their back on the structured decision making process by finding the most convenient solution and then enhance its positive qualities. The reason i simply that they by doing so avoid the hardship of attempting to rationaly structure and take responsibility for a problem and a decision with uncertain consequenses.