Special Issue for 11th International Conference of Iranian Operations Research Society

This is a special issue of the Iranian Journal of Operations Research that includes some of the invited talks presented at the 11th international conference of the Iranian Operations Research Society (IORS), organized jointly by IORS and Razi University of Kermanshah and held at the Razi University, Kermanshah, Iran, May 2-4, 2018. The IORS conference is held annually and is the main event for presentation of new theoretical and applied developments of OR. International participation is enhanced by some invited talks presented by international scholars. There were over 400 participants, 170 accepted talks and 69 poster presentations. The selected papers for this special issue were reviewed going through the usual reviewing process and 6 papers were accepted for publication.