Slovenia successfully concluded its way towards the EU membership. Croatia and other Western Balkan countries recently have started or wish to start on their way from Stabilization Association Agreements toward accession and full membership in the EU. EU has developed into complex economic, monetary and political union with 25 countries. Further enlargements of the EU will be a big challenge to the EU members and as well to the counties awaiting accession process and membership in the EU. Risks on the way to enlargement and new membership in the EU can be better controlled and in many instances even eliminated by accession approaches of future EU members, which will utilize experiences of the EU 15 members and guidance developed by countries which formed the last “wave” of the EU enlargement