In 1974, the belgian House of representatives as well as the Senate have decided to bring about some deep changes in their respective rules of procedure. These changes, worked-out within the rank and file of theresearch centres of the three principal political forces, are based on the specialization which is naturally met within an assembly. The Senate and the House of representatives, while respecting the proportional representation of the groups, got divided respectively into four and six sections destined to discuss definitively projects and propositions of law, budgets, as well as hear interpellations. The final vote is, in any case, left to the plenary assembly. This is the way the belgian Houses put into practice the idea of specialized chambers, which was evoked within the Association of the Secretaries general of Parliaments, in the early fifties, following the procedural innovation of the 1947 italian Constitution. The reform functions fully in the Senate, whereas the House of representatives calls up the sections to discuss only budgets and interpellations in relation to them.