Slovenian state assembly can be categorized as one of those new parliaments in Central and Eastern Europe that were not only beneficiaries of democratization but also major actors in the transition from the former socialist into a democratic system. It was in the forefront of the modernization of the entire legislature in the second stage of Europeization and played a major role in the process of EU accession. The state assembly as a new parliament has undoubtedly reached a satisfactory level of institutional and organizational competence. The problem is, however, its genuine subjective or “cultural capacity”. The lack of such capacities among the delegates in the process of EU accession was occasionally manifested in a huge disparity between the lip service to the EU membership and its values and the real understanding of the functioning of its institutions and goals. On numerous occasions there was a marked contrast between the idealized perceptions about how after the EU accession everything was going to be simpler and the pessimistic predictions about “drowning” in the EU. The Slovenian parliamentary elite has not yet fuly grasped the reality that the so called “internal” issues have largely become the European issues or that the European issues have already become “national” issues. On the other hand, too little attention is paid to the question of how demanding the participation of the Slovenian parliament in the circumstances of the full membership really is. The representatives will be exposed to a much more intensive flow of information from the EU institutions and the reaction time will get shorter. This will mean that the delegates will increasingly respond “reactively” instead of “actively”. The conlusion is that the state assembly at the commencement of its fourth mandate and following Slovenia’s EU accession is not yet fully qualified to participate – via the government – in the process of EU decision-making from the perspective of a swift grasp of vital information and taking stands; neither is it in the position to properly monitor the government. Also, the state assembly is not conversant enough in translating the European politics into the Slovenian setting since it lacks the necessary experience, knowledge and routine in operating in the new circumstances of multilevel decision-making. Due to this lack of precedents, the real hard work is only beginning.