This work investigates the efficacy and functional reality of the Early Warning System (EWS) as a mechanism for enforcing the principle of subsidiarity within the European Union. Philipp Kiiver, an expert in European constitutional law, examines the intersection of institutional design and political practice. By analyzing the procedural logic and material scope of the EWS, the author evaluates whether national parliaments effectively serve as guardians of subsidiarity or if the system functions primarily as a symbolic accountability tool.

Legal scholars and political scientists frequently cite this text as a foundational analysis of the EWS mechanism. Experts highlight the author's rigorous approach to reconciling theoretical constitutional frameworks with the practical application of EU legislative procedures.