63It is also to be observed that, by using the words ‘measures for the approximation’ in Article 114 TFEU, the authors of the Treaty intended to confer on the EU legislature a discretion, depending on the general context and the specific circumstances of the matter to be harmonised, as regards the method of approximation most appropriate for achieving the desired result, in particular in fields with complex technical features (judgments in Germany v Parliament and Council, C‑380/03, EU:C:2006:772, paragraph 42, and United Kingdom v Parliament and Council, C‑270/12, EU:C:2014:18, paragraph 102). It was thus open to the EU legislature, in the exercise of that discretion, to proceed towards harmonisation only in stages and to require only the gradual abolition of unilateral measures adopted by the Member States (judgment in Rewe-Zentral, 37/83, EU:C:1984:89, paragraph 20).
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