Although the definition of these principles set out by the Constitution corresponds to that already employed in the Treaties in force, the protocol on the principles of subsidiarity and proportionality provides for new mechanisms to guarantee compliance with those principles, in particular by substantially strengthening the role of the national parliaments.
Lai gan šo Konstitūcijā minēto principu definīcija atbilstu jau spēkā esošo līgumu darbībai, protokols par subsidiaritātes un proporcionalitātes principiem nodrošina jaunu mehānismu, kas garantē pakļaušanos šiem principiem, it īpaši būtiski nostiprinot dalībvalstu parlamentu lomu.