“…The special issue contains papers with wide range of relevant and contemporary topics in the area of OR which were also discussed by other authors in previous issues of this journal and other OR journals, such as the topics of IPM (Meszaros 2015), multicriteria optimization (Trdin and Bohanec 2018), social network analysis (Csató 2017), game theory (Aust and Buscher 2016;McCormick and Owen 2018). DEA (Šegota et al 2017), clustering (Scitovski et al 2017), and graph theory (Vinkó and Gelle 2017).…”