Free movement of persons constitutes one of the fundamental freedoms of the internal market, to the benefit of EU citizens, of the Member States and of the competitiveness of European economy. Flaws in the implementation of EU law in this field might result in a breach of the principles laying at the very core basis of the European construction. This is why the Commission will step up its efforts to ensure that EU citizens and their families effectively and fully enjoy their rights under the Directive. The Commission will use fully its powers under the Treaty to achieve this result, launching infringement proceedings when necessary, providing guidance to the Member States and ensuring that EU citizens are informed of their rights.