The Commission shall report to the European Parliament, to the Council and to the Economic and Social Committee every three years on the application of the provisions of this Part. This report shall take account of the development of the Union.

On this basis, and without prejudice to the other provisions of the Treaties, the Council, acting unanimously in accordance with a special legislative procedure and after obtaining the consent of the European Parliament, may adopt provisions to strengthen or to add to the rights listed in Article 20(2). These provisions shall enter into force after their approval by the Member States in accordance with their respective constitutional requirements.