Associations:
Slovenia:
SDI: Slovenian Society Informatika (Slovensko Društvo Informatika) Section for Operations Research
Europe:
CRORS: Croatian Operational Research Society
CSOR: Czech Operational Research Society
EURO: The Association of European Operational Research Societies
GOR: German Society of Operations Research
HORS: Hungarian Operational Research Society
ÖGOR: Austrian Society of Operations Research (Österreichische Gesellschaft für Operations Research)
POSRS: Polish Operational and Systems Research Society
SSOR: Slovak Society for Operations Research
International:
IFORS: International Federation of Operational Research Societies