This volume contains a selection of papers presented at the Symposium on Operations Research 2000 (OR 2000) held at the Dresden University of Technology, September 9-12, 2000. This international Symposium was organized by the German Operations Research Society GOR in the series of its annual conferences. The Symposium had 354 participants from IS countries around the world. The 210 lectures reflected the broad spectrum of Operations Research and its interdisciplinarity, involving economics, mathematics and computer science. The volume is arranged in 14 Sections, like the conference, and a special section with the papers of the winners of the GOR Diploma Thesis award. The 86 papers have been selected by the chairpersons of the sections and the editors. Compared to previous conferences, the number of sections has been reduced by combining some overlapping sections: The former sections for linear and nonlinear programming are now contained in the 'Continuous Optimization' Section, the graph theory has been included in the 'Discrete and Combinatorial Optimization' Section. The traditional application fields are growing together in the scope of the current 'Supply Chain Management' thinking. This is considered in a corresponding section. Its high number of papers at the conference and in this volume underlines the importance of Operations Research for this modem management concept. For the first time, the conference included a section on 'Didactics of Operations Research', which found a great echo and is represented by four papers in this volume.