The European Parliament is a member of the family of international parliamentary organs (lPOs). "Parts of international organisations, composed of parliamentarians", as they are often described, are in my view one of the most important achievements of the international community in the post world-war period. Though the IPOs are different among themselves, both in terms of their legal nature and in terms of their composition, the successes or failures of the European Parliament in its efforts to increasing its powers influences the success of similar attempts of other IPOs. To prove this relationship and to discuss possible consequences of further institutional reforms in the European Union for the European Parliament and consequently for the IPOs as a whole (especially in Europe), is the main subject of this paper