The Portuguese OR Society (Associação Portuguesa de Investigação Operacional - APDIO) is a scientific society, which brings together the Portuguese community interested in Operational Research. APDIO was founded in 1978 by 140 founding members, including university researchers, industrial professionals and several Portuguese Institutes and Companies as institucional associates. APDIO defines as its mission to contribute for the advance of Operational Research through courses, seminars, workshops, conferences and publications (such as scientific journals, bulletins and books). Furthermore, APDIO promotes the exchange of results, experiences and OR applications by electronic means like its web page (http://apdio.pt/home). The Portuguese OR Society is member of the International Federation of Operational Research Societies – IFORS and International Federation of Automatic Control - IFAC, since its very beginning. It is also a member of the Association of European Operational Research Societies - EURO and founding member of the Association of Latin-Iberoamerican Operational Research Societies - ALIO since 1982. APDIO has a reciprocity agreement with the Brazilian Society of Operations Research - SOBRAPO, since 2001.