Much has changed in European constitutional law after the Lisbon Treaty, not least the efforts to increase democratic legitimacy by engaging national legislatures and introducing a stricter subsidiary review process, namely the Early Warning Mechanism (EWM). This collection looks at how national parliaments have adapted to their new roles and looks at how the new system has impacted on relations between the EU legislative bodies and national parliaments. A team of experts from across Europe explore the effect of the EWM on the national constitutional orders; analyse the regional impact of EWM and evaluate the new system of scrutiny