46It follows that, in the absence of European Union legislation concerning the possibility for consumer protection associations to intervene in individual disputes involving consumers, it is for the national legal order of each Member State to establish such rules, in accordance with the principles of procedural autonomy, provided, however, that those rules are not less favourable than those governing similar domestic situations (principle of equivalence) and that they do not make it excessively difficult or impossible in practice to exercise the rights conferred by European Union law (principle of effectiveness).
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