63As regards the principle of effectiveness, national procedural rules must not be such as to render impossible in practice or excessively difficult the exercise of rights conferred by the EU legal order. In that regard, account should be taken of the role of those provisions in the procedure, its progress and special features, viewed as a whole, before the various national instances. In that context, it is appropriate to take into consideration, where relevant, the principles which lie at the basis of the national legal system, such as the protection of the rights of the defence, the principle of legal certainty and the proper conduct of the proceedings (judgment of 15 March 2017, Aquino, C‑3/16, EU:C:2017:209, paragraphs 52 and 53, and the case-law cited).
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