The aim of this work is to demonstrate to what extent multi-objective decision-making processes can be optimized through the integration of fuzzy logic. As an introduction to the topic of multi-objective decision-making, the first part of the work characterizes the fundamentals of decision theory. The second section outlines the complex systems involved in multi-criteria decision-making processes. The intention is to determine the suitability of these processes for the integration of fuzzy logic. Here, the four most significant methods are presented. Following the presentation of these methods, they are differentiated based on their suitability for integration. Subsequently, fuzzy logic is explained in detail. In this regard, the focus is initially on its historical development as well as aspects of the theory. Furthermore, V.