ORBEL conferences are organized yearly, in January, and bring together most of the people concerned with operational research and quantitative techniques for decision making in Belgium; they also attract a number of specialists from the neighboring countries.
The ORBEL conferences consist in invited lectures delivered by prominent foreign specialists and practitioners on topics of general interest; more specialized contributed papers are presented in parallel sessions by young researchers. The winner of the ORBEL award for the best master thesis in operational research is also announced at the conference and invited to present his/her work there.
Workshops on a particular theme. These one-day meetings are devoted to a single topic; the invited lectures are selected in order to provide an overview of recent and important developments in some field of interest.
In recent years, workshops have been devoted to Discrete-event simulation, Fuzzy Logic and Constraint Programming, Data mining and Operations Research and Optimization in Engineering.