Multi-criteria decision-making (MCDM) represents one of the core research streams in the field of operations research (OR). Altough numerous sound MCDM methods for various kind of applications exist, the application of such methods in the practical field is found rarely. The reason for this gap between scientific development and practical acceptance can be found in two distinct points: On the one hand, MCDM methods naturally tend to build on rather complex mathematical foundations. Decision makers (DMs) in practice are mostly experts in their area of expertise but do not necessarily have solid education or experience with high-level mathematical methods. Thus, in order to not alienate DMs in practice, academic research has to translate mathematically challenging models into easy-to-use, self-explaining tools that can effectively support real-life decision scenarios. On the other hand, academic research in MCDM often ends in the proposal of a theoretical model, that may be sound and promising, but never leaves the field of academics due to its theoretical nature. Therefore, the underlying dissertation investigates on the usage of MCDM methods for integration in a decision support system (DSS), implemented as a sofware that is easy to distribute and applicable to decision problems in practice. This study tries to mitigate the lack of MCDM acceptance by analysing MCDM methods according to their applicability, pointing out possible improvements and validating proposed advancements. (author's abstract)