Healthcare systems worldwide are facing problems in providing health care to patients in a pandemic caused by the SARS-CoV-2 virus (COVID-19). The pandemic causes an extreme disease to spread with fluctuating needs among patients, which significantly affect the capacity and overall performance of healthcare systems. In addition, its impact on the sustainability of the entire economic and social system is enormous and certain sustainable management strategies need to be selected. To meet the challenges of the COVID-19 pandemic and ensure sustainable performance, national healthcare systems must adapt to new circumstances. This paper proposes an original multi-criteria methodology for the sustainable selection of strategic guidelines for the reorganization of a healthcare system under the conditions of the COVID-19 pandemic. The selection of an appropriate strategic guideline is made on the basis of defined criteria and depending on infection capacity and pandemic spread risk. The criteria for the evaluation of strategic guidelines were defined on the basis of a survey in which the medical personnel engaged in the crisis response team during the COVID-19 pandemic in the Republic of Serbia participated. The Level-Based Weight Assessment (LBWA) model and Measuring Attractiveness by a Categorical-Based Evaluation Technique (MACBETH) method were used to determine the weight coefficient criteria, while a novel fuzzy Ranking of Alternatives through Functional Mapping of Criterion Subintervals into a Single Interval (RAFSI) model was used to evaluate the strategic guidelines. The proposed multi-criteria methodology was tested in a case study in the Republic of Serbia. The validity of the proposed methodology is shown through the simulation of changes in input parameters of Bonferroni aggregation functions and through a comparison with other multi-criteria methodologies.

Bosnia and Herzegovina (B&H) possess many natural resources that can be exploited for the development of medical tourism. The offer of medical tourism in B&H is focused on spa tourism. B&H has 16 registered spa-centers offering different types of services. This study provides a complete overview of the assessment of the current state of spa-centres using expert decision-making and methods of multi-criteria analysis. An innovative and novel MCDM model based on integration of the FUCOM (full consistency method) and fuzzy MARCOS (Measurement of Alternatives and Ranking according to COmpromise Solution) methods was used. The model consists of 16 alternatives and eight sustainable criteria. The results of this research have shown that the spa-centers of Ilidža near Sarajevo, Fojnica and Vrućica have the best assessments of the current situation and prerequisites for sustainable business. These spa-centers should be a benchmark to other spas providing direction on how to improve their business to be more sustainable and competitive in the market. These results were confirmed by a sensitivity analysis with two approaches used. The first approach was to compare the results obtained by the fuzzy MARCOS method with other fuzzy methods, and the second approach was to examine the influence of the application of different weights on the final ranking of the spa. The results of this study can serve spa-canter managers to understand the position of their spa-centers in order to exploit advantages they have and eliminate the shortcomings to improve their business.

A multi-attribute decision-making process and ranking of investment projects is almost inevitable today in order to realize and achieve an investment project. We can observe the given process from the aspect of decision theory. Today, it is unthinkable to make a decision on the acceptance of an investment project, without looking at different criteria, the only option is to set the choice of an investment project as a multi-attributive decision-making problem. The goal of this paper is to present a multi-attribute decision-making model, when we have several proposed investment projects and when I want to evaluate the given projects and just rank them for choosing the best method. Based on its wide application, the AHP method will be used to determine the weights of the criteria themselves during the decision-making process, while the MABAC method will be used for the further process of ranking investment projects in order to obtain a single-investment ranking of proposed alternatives, more precisely, proposed investment projects.

The impact of the previous and future education of managers on the speed of introducing business changes in business entities in the Republic of Serbia is a topic that has not received enough attention so far. The presented research is a segment of the research previously conducted as part of the doctoral dissertation written by Dragan Doljanica from the Faculty of Management, Economics and Finance in Belgrade. The research discusses possible mathematical projections and solutions, which are supported by extensive statistical empirical research in the field of education and management.

In order to improve both the internal and external functionality of the organization, organizational changes are increasingly sought. Changes are of great importance and without a doubt they are of crucial importance for strengthening and improving organizational efficiency. Organizational changes were always complemented by planned strategies and aligned with the organizational goal. The process of change is very challenging and important for organizations because it represents its path to success. Also, through organizational changes, organizations can be made capable of meeting future consumer demands and competing effectively with other market participants. However, many authors state that the changes are conditioned by a large number of factors. The aim of this paper is to examine the impact of leadership and innovation on the development of organizational changes in organizations in Serbia.