Allegro: The international key role played by the Sogesci-BVWB for the promotion and the developments of Operational Research OR in Europe and in the world (Jean-Pierre BRANS). The role of the Belgian Operational Research OR Soceity on the international scene is sketched. An overview is given of the activities of the Sogesci-BVWB and some of its members in EURO. Names and places are given of participations and organisation of the EURO-conferences, the mini EURO-conferences, the Euro Summer Institute and the Euro Gold Modal. Andante: A look to the past: Happy Birthday Jorbel (Jacques TEGHEM). The Sogesci-BVWB written channel to the outside world is its journal. The history of the journal is drawn from its roots started by three societies to its current state, 35 years later, with its name JORBEL, its current committee and its changed policies. Adagio: Origin and history of the ORBEL congresses (Fernand BROECKX). Scientists like to join each other at conferences. The present societies’ conference got the name ORBEL. The author being president of the society both at the first Orbel conference as at the tenth jubilee makes a report on the various locations, chairmen and invited speakers. The origins to the conference series is highlighted by drawing up a list of one-day conferences ogranised eariler, known under the name of Round Tables.
