1. Introduction.- Part I: Economics.- 2. Has Twenty Years of Slovenia's EU Membership Boosted Competitiveness and Foreign Direct Investments?.- 3. Financial Aspects of Slovenia's Membership in the EU.- 4. Practice Makes Progress, Not Perfect: Twenty Years of Slovenian Participation in the EU Internal Market.- 5. Significant Improvement but Also Missed Opportunities: Slovenian Innovation Policy from 2004 to 2024.- 6. A Proactive Approach to Co-creating the European Research Area: The Case of Slovenia in the Last Twenty Years.- Part II: CFSP.- 7. Twenty Years in the EU (CFSP): From "Now What?" to Finding a Distinct Voice for Slovenia's Foreign Policy.- 8. All good-neighbourly? Bilateral relations with Croatia during 20 years of Slovenian EU membership.- 9. Slovenia and Common Security and Defence Policy: Is There a True North for Slovenia in the Strategic Compass?.- 10. A Good Pupil in an Unpredictable Classroom: The Impact of EU Membership on Human Rights Protection in Slovenia from 2004 to 2023.- Part III: Europeanisation.- 11. Slovenian Public Opinion on Europe.- 12. European Elections in Slovenia: Who Ran and Who Was Elected in 2004, 2009, 2014, and 2019?.- 13. Gradual, Pragmatic and Flexible: The Europeanization of Institutions and the Coordination of EU Affairs.- 14. Slovenia(ns) in the European Union: Reflecting on Missed Opportunities and Lessons Learned Two Decades Later.