PRAKSAGORAS: A group decision support system for the improvement of the health care servicesPRAKSAGORAS: A group decision support system for the improvement of the health care services Πλήρης Δημοσίευση σε Συνέδριο Conference Full Paper 2015-11-052015enOne of the main characteristics of the health sector is that consumes a large proportion of GDP across the European Union. For this reason in our days the health care policy makers use advanced models in order to evaluate the health care services and more over to redesign them in order to improve their effectiveness. Studying the academic literature it’s obvious that the majority of the models that have been developed for the improvement of the health care services don’t take into account the opinions of the citizens. Another limitation is that the majority of the methodologies take into account only the preference model of one decision maker. Some recent research approaches in order to tackle the aforementioned problem use satisfaction questionnaires in order to enable the citizens in the area of reorganization of the health care services. Praksagoras is a Group Decision Support System that has been developed in order to redesign the health care services and moreover to improve the decision making process by enabling many decision makers like CEO of the hospital, the Physicians and the patients. Praksagoras combines simulations, Multicriteria satisfaction analysis, social choice theory and the aggregation disaggregation approach of Multi-criteria analysis. More specifically, via the simulation model the system depicts the current operation of the emergency departments. The modeler has the ability to test alternatives scenarios for the emergency department in order to test the impacts of these alternatives scenarios on consistent set of criteria such as waiting times, length of stay, working load of the personnel and bed usage. The MUSA model reveals the weak points of the services giving the opportunity to the analyst to develop alternatives that are based on patients’ needs. In order to enable many stakeholders (doctors, patients etc.) in the decision making process we use the RACES approach. Races approach incorporates the social choice functions for aggregating individual rankings with MINORA and MIIDAS systems, in order to assess value function(s), as compatible as possible with a collective ranking. The main aim of this approach is to provide mechanisms for the support of the analysis of the individual and collective preference models and to enrich the knowledge of the decision problem and the structure of DM's preferences.http://creativecommons.org/licenses/by/4.0/ 26th National Conference on Operational Research Matsatsinis Nikolaos Ματσατσινης Νικολαος Panagiotis Manolitzas Grigoroudis, Evangelos Athanasios Spyridakos Denis Yannacopoulos Delivery of health care Delivery of medical care Health care Health care delivery Health services Healthcare Medical and health care industry Medical services Personal health services medical care delivery of health care delivery of medical care health care health care delivery health services healthcare medical and health care industry medical services personal health services