To design a high quality processes and to achieve effective decisions various computer-aided systems can be used. For complex decisions when several alternatives are taken into consideration and a lot of criteria are involved multi criteria decision support systems can be successfully applied. Theoretical model of a real life situation, i.e. a comprehensive conceptual and quantitative description of alternative variants by a set of criteria constitutes a part of decision support system [4]. The next very important step is to select the most suitable MCDM (Multiple Criteria Decision Making) method to determine the optimal alternative. Selection of MCDM methods based on various parameters was analyzed in a number of papers [1, 5-7, 10, 11]. The further the more combination of several methods and development of decision making software are discussed [2, 4, 8, 15]. Robustness of methods or their combination is analyzed [3,13].
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